Correct init idx2name on mult-CPU/GPU training
Correct init idx2name on mult-CPU/GPU training

In Module.init_optimizer, idx2name has duplicated items when multiple
contexts are provided.
But _update_params_on_kvstore will be used in this case, and the
duplication of items will cause wrong indexing in Optimizer._get_lr and
Optimizer._get_wd.

Guneet-Dhillon/mxnet,sergeykolychev/mxnet,smolix/incubator-mxnet,sergeykolychev/mxnet,danithaca/mxnet,jennyzhang0215/incubator-mxnet,luoyetx/mxnet,fullfanta/mxnet,pluskid/mxnet,saurabh3949/mxnet,wangyum/mxnet,larroy/mxnet,ForkedReposBak/mxnet,fullfanta/mxnet,ykim362/mxnet,crazy-cat/incubator-mxnet,zhreshold/mxnet,Ldpe2G/mxnet,navrasio/mxnet,formath/mxnet,LinkHS/incubator-mxnet,rahul003/mxnet,ykim362/mxnet,kkk669/mxnet,LinkHS/incubator-mxnet,jennyzhang0215/incubator-mxnet,pluskid/mxnet,danithaca/mxnet,ForkedReposBak/mxnet,kevinthesun/mxnet,weleen/mxnet,thirdwing/mxnet,szha/mxnet,antoan2/incubator-mxnet,hesseltuinhof/mxnet,crazy-cat/incubator-mxnet,DR08/mxnet,tlby/mxnet,szha/mxnet,sergeykolychev/mxnet,Ldpe2G/mxnet,rishita/mxnet,hesseltuinhof/mxnet,rahul003/mxnet,eric-haibin-lin/mxnet,DR08/mxnet,navrasio/mxnet,TuSimple/mxnet,lxn2/mxnet,Northrend/mxnet,weleen/mxnet,DR08/mxnet,precedenceguo/mxnet,xcgoner/dist-mxnet,likelyzhao/mxnet,reminisce/mxnet,formath/mxnet,indhub/mxnet,coder-james/mxnet,tlby/mxnet,Mega-DatA-Lab/mxnet,coder-james/mxnet,EvanzzzZ/mxnet,eric-haibin-lin/mxnet,ShownX/incubator-mxnet,leezu/mxnet,hotpxl/mxnet,kevinthesun/mxnet,vikingMei/mxnet,fullfanta/mxnet,zhreshold/mxnet,gautamkmr/incubator-mxnet,vikingMei/mxnet,smolix/incubator-mxnet,Guneet-Dhillon/mxnet,eric-haibin-lin/mxnet,apaleyes/mxnet,kkk669/mxnet,jiajiechen/mxnet,ForkedReposBak/mxnet,kevinthesun/mxnet,antoan2/incubator-mxnet,yuruofeifei/mxnet,arank/mxnet,saurabh3949/mxnet,hotpxl/mxnet,apaleyes/mxnet,TuSimple/mxnet,yajiedesign/mxnet,jennyzhang0215/incubator-mxnet,madjam/mxnet,ykim362/mxnet,jamesliu/mxnet,indhub/mxnet,yajiedesign/mxnet,navrasio/mxnet,piiswrong/mxnet,thirdwing/mxnet,wangyum/mxnet,nicklhy/mxnet,kkk669/mxnet,vikingMei/mxnet,ZihengJiang/mxnet,kevinthesun/mxnet,eric-haibin-lin/mxnet,smolix/incubator-mxnet,weleen/mxnet,ShownX/incubator-mxnet,apaleyes/mxnet,ForkedReposBak/mxnet,arikpoz/mxnet,indhub/mxnet,hpi-xnor/BMXNet,LinkHS/incubator-mxnet,Guneet-Dhillon/mxnet,TuSimple/mxnet,rahul003/mxnet,gautamkmr/incubator-mxnet,sxjscience/mxnet,dmlc/mxnet,jennyzhang0215/incubator-mxnet,madjam/mxnet,sergeykolychev/mxnet,kevinthesun/mxnet,antoan2/incubator-mxnet,ForkedReposBak/mxnet,LinkHS/incubator-mxnet,mbaijal/incubator-mxnet,likelyzhao/mxnet,zhreshold/mxnet,danithaca/mxnet,weleen/mxnet,zhreshold/mxnet,solin319/incubator-mxnet,solin319/incubator-mxnet,stefanhenneking/mxnet,EvanzzzZ/mxnet,Prasad9/incubator-mxnet,hesseltuinhof/mxnet,yuruofeifei/mxnet,mbaijal/incubator-mxnet,crazy-cat/incubator-mxnet,rahul003/mxnet,Mega-DatA-Lab/mxnet,danithaca/mxnet,larroy/mxnet,wangyum/mxnet,hesseltuinhof/mxnet,coder-james/mxnet,piiswrong/mxnet,EvanzzzZ/mxnet,gautamkmr/incubator-mxnet,crazy-cat/incubator-mxnet,antoan2/incubator-mxnet,Mega-DatA-Lab/mxnet,apaleyes/mxnet,rishita/mxnet,DR08/mxnet,xcgoner/dist-mxnet,Northrend/mxnet,luoyetx/mxnet,ykim362/mxnet,szha/mxnet,Guneet-Dhillon/mxnet,sergeykolychev/mxnet,saurabh3949/mxnet,Ldpe2G/mxnet,zhreshold/mxnet,luoyetx/mxnet,jermainewang/mxnet,rishita/mxnet,ForkedReposBak/mxnet,ptrendx/mxnet,ShownX/incubator-mxnet,jiajiechen/mxnet,indhub/mxnet,apaleyes/mxnet,formath/mxnet,luoyetx/mxnet,solin319/incubator-mxnet,TuSimple/mxnet,tlby/mxnet,rishita/mxnet,stefanhenneking/mxnet,TuSimple/mxnet,pluskid/mxnet,ykim362/mxnet,madjam/mxnet,ZihengJiang/mxnet,apache/incubator-mxnet,danithaca/mxnet,navrasio/mxnet,navrasio/mxnet,yajiedesign/mxnet,vikingMei/mxnet,kkk669/mxnet,navrasio/mxnet,pluskid/mxnet,thirdwing/mxnet,CodingCat/mxnet,CodingCat/mxnet,larroy/mxnet,Mega-DatA-Lab/mxnet,likelyzhao/mxnet,ptrendx/mxnet,rishita/mxnet,arikpoz/mxnet,tlby/mxnet,coder-james/mxnet,DR08/mxnet,piiswrong/mxnet,arank/mxnet,kkk669/mxnet,lxn2/mxnet,jiajiechen/mxnet,Mega-DatA-Lab/mxnet,kevinthesun/mxnet,arank/mxnet,Northrend/mxnet,sxjscience/mxnet,Guneet-Dhillon/mxnet,navrasio/mxnet,rishita/mxnet,CodingCat/mxnet,zhreshold/mxnet,reminisce/mxnet,jermainewang/mxnet,tornadomeet/mxnet,reminisce/mxnet,ZihengJiang/mxnet,ykim362/mxnet,weleen/mxnet,hpi-xnor/BMXNet,lxn2/mxnet,eric-haibin-lin/mxnet,yuruofeifei/mxnet,TuSimple/mxnet,ZihengJiang/mxnet,leezu/mxnet,CodingCat/mxnet,ptrendx/mxnet,lxn2/mxnet,mbaijal/incubator-mxnet,jiajiechen/mxnet,mbaijal/incubator-mxnet,indhub/mxnet,mbaijal/incubator-mxnet,arank/mxnet,CodingCat/mxnet,Mega-DatA-Lab/mxnet,jermainewang/mxnet,fullfanta/mxnet,sergeykolychev/mxnet,xcgoner/dist-mxnet,jennyzhang0215/incubator-mxnet,hesseltuinhof/mxnet,arank/mxnet,jermainewang/mxnet,leezu/mxnet,stefanhenneking/mxnet,larroy/mxnet,Ldpe2G/mxnet,wangyum/mxnet,rishita/mxnet,Northrend/mxnet,CodingCat/mxnet,yajiedesign/mxnet,hesseltuinhof/mxnet,Prasad9/incubator-mxnet,kkk669/mxnet,arikpoz/mxnet,mbaijal/incubator-mxnet,vikingMei/mxnet,saurabh3949/mxnet,kkk669/mxnet,jermainewang/mxnet,lxn2/mxnet,reminisce/mxnet,yajiedesign/mxnet,precedenceguo/mxnet,xcgoner/dist-mxnet,eric-haibin-lin/mxnet,jiajiechen/mxnet,crazy-cat/incubator-mxnet,antoan2/incubator-mxnet,Guneet-Dhillon/mxnet,tornadomeet/mxnet,tlby/mxnet,crazy-cat/incubator-mxnet,sxjscience/mxnet,fullfanta/mxnet,jermainewang/mxnet,likelyzhao/mxnet,navrasio/mxnet,DR08/mxnet,jamesliu/mxnet,Northrend/mxnet,jamesliu/mxnet,formath/mxnet,DickJC123/mxnet,luoyetx/mxnet,indhub/mxnet,piiswrong/mxnet,ShownX/incubator-mxnet,hotpxl/mxnet,LinkHS/incubator-mxnet,apaleyes/mxnet,leezu/mxnet,madjam/mxnet,tornadomeet/mxnet,ForkedReposBak/mxnet,yuruofeifei/mxnet,yuruofeifei/mxnet,jennyzhang0215/incubator-mxnet,thirdwing/mxnet,TuSimple/mxnet,LinkHS/incubator-mxnet,smolix/incubator-mxnet,Prasad9/incubator-mxnet,dmlc/mxnet,precedenceguo/mxnet,dmlc/mxnet,CodingCat/mxnet,leezu/mxnet,DickJC123/mxnet,tlby/mxnet,Guneet-Dhillon/mxnet,xcgoner/dist-mxnet,Prasad9/incubator-mxnet,stefanhenneking/mxnet,gautamkmr/incubator-mxnet,nicklhy/mxnet,ZihengJiang/mxnet,hpi-xnor/BMXNet,tornadomeet/mxnet,CodingCat/mxnet,smolix/incubator-mxnet,crazy-cat/incubator-mxnet,smolix/incubator-mxnet,mbaijal/incubator-mxnet,wangyum/mxnet,yuruofeifei/mxnet,hpi-xnor/BMXNet,crazy-cat/incubator-mxnet,rahul003/mxnet,Prasad9/incubator-mxnet,leezu/mxnet,gautamkmr/incubator-mxnet,rahul003/mxnet,fullfanta/mxnet,coder-james/mxnet,precedenceguo/mxnet,LinkHS/incubator-mxnet,ForkedReposBak/mxnet,solin319/incubator-mxnet,lxn2/mxnet,piiswrong/mxnet,reminisce/mxnet,formath/mxnet,szha/mxnet,precedenceguo/mxnet,Mega-DatA-Lab/mxnet,reminisce/mxnet,hpi-xnor/BMXNet,precedenceguo/mxnet,sxjscience/mxnet,formath/mxnet,yajiedesign/mxnet,thirdwing/mxnet,ShownX/incubator-mxnet,saurabh3949/mxnet,tlby/mxnet,jiajiechen/mxnet,indhub/mxnet,ptrendx/mxnet,LinkHS/incubator-mxnet,weleen/mxnet,indhub/mxnet,mbaijal/incubator-mxnet,hotpxl/mxnet,arank/mxnet,coder-james/mxnet,madjam/mxnet,arikpoz/mxnet,hotpxl/mxnet,ShownX/incubator-mxnet,ForkedReposBak/mxnet,jennyzhang0215/incubator-mxnet,DickJC123/mxnet,Northrend/mxnet,vikingMei/mxnet,ykim362/mxnet,Northrend/mxnet,luoyetx/mxnet,apache/incubator-mxnet,dmlc/mxnet,Ldpe2G/mxnet,tlby/mxnet,indhub/mxnet,dmlc/mxnet,yuruofeifei/mxnet,zhreshold/mxnet,fullfanta/mxnet,xcgoner/dist-mxnet,solin319/incubator-mxnet,nicklhy/mxnet,yajiedesign/mxnet,piiswrong/mxnet,jamesliu/mxnet,solin319/incubator-mxnet,smolix/incubator-mxnet,weleen/mxnet,EvanzzzZ/mxnet,larroy/mxnet,pluskid/mxnet,likelyzhao/mxnet,stefanhenneking/mxnet,vikingMei/mxnet,yuruofeifei/mxnet,rishita/mxnet,kevinthesun/mxnet,gautamkmr/incubator-mxnet,danithaca/mxnet,navrasio/mxnet,thirdwing/mxnet,ZihengJiang/mxnet,rahul003/mxnet,szha/mxnet,szha/mxnet,sxjscience/mxnet,gautamkmr/incubator-mxnet,jiajiechen/mxnet,hotpxl/mxnet,danithaca/mxnet,precedenceguo/mxnet,DR08/mxnet,lxn2/mxnet,pluskid/mxnet,arikpoz/mxnet,CodingCat/mxnet,tornadomeet/mxnet,Ldpe2G/mxnet,tlby/mxnet,ZihengJiang/mxnet,piiswrong/mxnet,yajiedesign/mxnet,reminisce/mxnet,hotpxl/mxnet,Guneet-Dhillon/mxnet,szha/mxnet,thirdwing/mxnet,rishita/mxnet,sxjscience/mxnet,tornadomeet/mxnet,thirdwing/mxnet,likelyzhao/mxnet,larroy/mxnet,rahul003/mxnet,Ldpe2G/mxnet,Prasad9/incubator-mxnet,pluskid/mxnet,luoyetx/mxnet,piiswrong/mxnet,ShownX/incubator-mxnet,xcgoner/dist-mxnet,ShownX/incubator-mxnet,Northrend/mxnet,szha/mxnet,larroy/mxnet,zhreshold/mxnet,weleen/mxnet,antoan2/incubator-mxnet,arikpoz/mxnet,ptrendx/mxnet,nicklhy/mxnet,saurabh3949/mxnet,likelyzhao/mxnet,szha/mxnet,hotpxl/mxnet,kkk669/mxnet,jermainewang/mxnet,apaleyes/mxnet,wangyum/mxnet,madjam/mxnet,TuSimple/mxnet,madjam/mxnet,Prasad9/incubator-mxnet,gautamkmr/incubator-mxnet,DickJC123/mxnet,saurabh3949/mxnet,stefanhenneking/mxnet,tornadomeet/mxnet,tornadomeet/mxnet,yajiedesign/mxnet,saurabh3949/mxnet,arank/mxnet,madjam/mxnet,stefanhenneking/mxnet,leezu/mxnet,arank/mxnet,piiswrong/mxnet,antoan2/incubator-mxnet,ptrendx/mxnet,stefanhenneking/mxnet,nicklhy/mxnet,tlby/mxnet,antoan2/incubator-mxnet,LinkHS/incubator-mxnet,precedenceguo/mxnet,hotpxl/mxnet,eric-haibin-lin/mxnet,solin319/incubator-mxnet,lxn2/mxnet,sxjscience/mxnet,leezu/mxnet,crazy-cat/incubator-mxnet,sergeykolychev/mxnet,pluskid/mxnet,coder-james/mxnet,precedenceguo/mxnet,formath/mxnet,coder-james/mxnet,arikpoz/mxnet,apache/incubator-mxnet,likelyzhao/mxnet,apaleyes/mxnet,kkk669/mxnet,sergeykolychev/mxnet,dmlc/mxnet,luoyetx/mxnet,wangyum/mxnet,apache/incubator-mxnet,ptrendx/mxnet,apaleyes/mxnet,larroy/mxnet,EvanzzzZ/mxnet,dmlc/mxnet,arank/mxnet,madjam/mxnet,eric-haibin-lin/mxnet,leezu/mxnet,DR08/mxnet,arikpoz/mxnet,ZihengJiang/mxnet,Guneet-Dhillon/mxnet,jennyzhang0215/incubator-mxnet,luoyetx/mxnet,jiajiechen/mxnet,xcgoner/dist-mxnet,sergeykolychev/mxnet,likelyzhao/mxnet,smolix/incubator-mxnet,gautamkmr/incubator-mxnet,thirdwing/mxnet,jamesliu/mxnet,jermainewang/mxnet,nicklhy/mxnet,hpi-xnor/BMXNet,saurabh3949/mxnet,ptrendx/mxnet,wangyum/mxnet,tornadomeet/mxnet,zhreshold/mxnet,DR08/mxnet,eric-haibin-lin/mxnet,solin319/incubator-mxnet,rahul003/mxnet,Mega-DatA-Lab/mxnet,smolix/incubator-mxnet,nicklhy/mxnet,Mega-DatA-Lab/mxnet,TuSimple/mxnet,ykim362/mxnet,hesseltuinhof/mxnet,hesseltuinhof/mxnet,hpi-xnor/BMXNet,jamesliu/mxnet,reminisce/mxnet,Northrend/mxnet,mbaijal/incubator-mxnet,Prasad9/incubator-mxnet,nicklhy/mxnet,vikingMei/mxnet,vikingMei/mxnet,hpi-xnor/BMXNet,danithaca/mxnet,dmlc/mxnet,danithaca/mxnet,jiajiechen/mxnet,antoan2/incubator-mxnet,jamesliu/mxnet,ptrendx/mxnet,Prasad9/incubator-mxnet,fullfanta/mxnet,TuSimple/mxnet,sxjscience/mxnet,ptrendx/mxnet,kevinthesun/mxnet,arikpoz/mxnet,reminisce/mxnet,formath/mxnet,wangyum/mxnet,EvanzzzZ/mxnet,coder-james/mxnet,jamesliu/mxnet,Ldpe2G/mxnet,reminisce/mxnet,ykim362/mxnet,ShownX/incubator-mxnet,sxjscience/mxnet,jermainewang/mxnet,nicklhy/mxnet,EvanzzzZ/mxnet,jennyzhang0215/incubator-mxnet,larroy/mxnet,fullfanta/mxnet,kevinthesun/mxnet,jamesliu/mxnet,stefanhenneking/mxnet,hpi-xnor/BMXNet,EvanzzzZ/mxnet,xcgoner/dist-mxnet,EvanzzzZ/mxnet,yuruofeifei/mxnet,solin319/incubator-mxnet,Ldpe2G/mxnet,ZihengJiang/mxnet,lxn2/mxnet,dmlc/mxnet,formath/mxnet,pluskid/mxnet,weleen/mxnet,hesseltuinhof/mxnet