wal: log errors in wal.Close()
wal: log errors in wal.Close()

This patch adds error logging in wal.Close() if unlocking and
destroying fail. Though it is hard to handling the errors, logging
would be helpful for trouble shooting.

Winslett/etcd,lumjjb/etcd,mqliang/etcd,Yhgenomics/etcd,jlamillan/etcd,glycerine/etcd,gityf/etcd,ravigadde/etcd,etcd-io/etcd,sebrandon1/etcd,purpleidea/etcd,jeremyeder/etcd,gityf/etcd,luxas/etcd,fgbreel/etcd,Timer/etcd,gyuho/etcd,shakefu/etcd,ravigadde/etcd,msanterre/etcd,nkhare/etcd,beni55/etcd,nkhare/etcd,kkaneda/etcd,wantonsolutions/dinv-etcd,wowsoso/etcd,plasticbox/etcd,chipironcin/etcd,beni55/etcd,YuleiXiao/etcd,armstrongli/etcd,onlyjob/etcd,lzbgt/etcd,linuxcer/etcd,cchamplin/etcd,mqliang/etcd,HideoYamauchi/etcd,chipironcin/etcd,hroyrh/etcd,pauldallen/etcd,linuxcer/etcd,mkumatag/etcd,polvi/etcd,ajityagaty/etcd,jefby/etcd,a-robinson/etcd,buaazp/etcd,tamird/etcd,ktateish/etcd,arthurcolle/etcd,whuwxl/etcd,njharman/etcd,zaphod-concur/etcd,StorReduce/etcd,arthurcolle/etcd,mkumatag/etcd,nekto0n/etcd,gyuho/etcd,fasaxc/etcd,glycerine/etcd,achanda/etcd,westhood/etcd,junxu/etcd,yyljlyy/etcd,tguangch/etcd,steveeJ/etcd,hroyrh/etcd,cchamplin/etcd,ajityagaty/etcd,improbable-io/etcd,xychu/etcd,yudai/etcd,openedbox/etcd,etcd-io/etcd,junxu/etcd,openedbox/etcd,snailwalker/etcd,glevand/coreos--etcd,endocode/etcd,li-ang/etcd,cognusion/etcd,njucslqq/etcd,CrazyJvm/etcd,yudai/etcd,vimalk78/etcd,mqliang/etcd,insequent/etcd,dannysauer/etcd,siddontang/etcd,rnaveiras/etcd,yichengq/etcd,sinsharat/etcd,vimalk78/etcd,heyitsanthony/etcd,ktateish/etcd,akauppi/etcd,xiang90/etcd,fgbreel/etcd,Timer/etcd,rnaveiras/etcd,dalanlan/etcd,onlyjob/etcd,visheshnp/etcd,kkaneda/etcd,freeloop1114/etcd,tempbottle/etcd,insionng/etcd,armstrongli/etcd,SivagnanamCiena/etcd,elimisteve/etcd,rnaveiras/etcd,bdarnell/etcd,tangkun75/etcd,nekto0n/etcd,xychu/etcd,dnaeon/etcd,freeloop1114/etcd,jonboulle/etcd,lzbgt/etcd,coreos/etcd,dannysauer/etcd,jonboulle/etcd,insequent/etcd,HideoYamauchi/etcd,sayden/etcd,Eagle-X/etcd,sinsharat/etcd,youxidev/etcd,shawnps/etcd,cockroachdb/etcd,axingblog/etcd,rchicoli/etcd,steveeJ/etcd,mike-lerch/etcd,glevand/coreos--etcd,YuleiXiao/etcd,etcd-io/etcd,imzhulei/etcd,youxidev/etcd,sebschrader/etcd,giantswarm/etcd,combk8s/etcd,oscarrr110/etcd,lorneli/etcd,handsomesun/etcd,dalanlan/etcd,tangkun75/etcd,whuwxl/etcd,njharman/etcd,Eagle-X/etcd,li-ang/etcd,a-robinson/etcd,hongchaodeng/etcd,hongbinz/etcd,visheshnp/etcd,lumjjb/etcd,jefby/etcd,pauldallen/etcd,delkyd/etcd,es-chow/etcd,westhood/etcd,ajityagaty/etcd,sebschrader/etcd,endocode/etcd,asim/etcd,msanterre/etcd,chenbaihu/etcd,jchauncey/etcd,OyTao/etcd_learning,gae123/etcd,bluebreezecf/etcd,xiang90/etcd,iamqizhao/etcd,cockroachdb/etcd,TheHippo/etcd,SivagnanamCiena/etcd,qqsun8819/etcd,bluebreezecf/etcd,rchicoli/etcd,shakefu/etcd,honeyqa/etcd,spacejam/etcd,swingbach/etcd,elimisteve/etcd,cognusion/etcd,jeremyeder/etcd,lorneli/etcd,fasaxc/etcd,gouyang/etcd,gouyang/etcd,TheHippo/etcd,xdlinear/etcd,gae123/etcd,betawaffle/etcd,njucslqq/etcd,dnaeon/etcd,mickep76/etcd,akauppi/etcd,raoofm/etcd,sofuture/etcd,coreos/etcd,StorReduce/etcd,tempbottle/etcd,mickep76/etcd,tguangch/etcd,polvi/etcd,achanda/etcd,wantonsolutions/dinv-etcd,insionng/etcd,swingbach/etcd,Winslett/etcd,jchauncey/etcd,snailwalker/etcd,wantonsolutions/dinv-etcd,tamird/etcd,iamqizhao/etcd,imzhulei/etcd,es-chow/etcd,raoofm/etcd,zaphod-concur/etcd,mkumatag/etcd,sebrandon1/etcd,shawnps/etcd,combk8s/etcd,oscarrr110/etcd,fanminshi/etcd,giantswarm/etcd,svdata/etcd,delkyd/etcd,heyitsanthony/etcd,yichengq/etcd,axingblog/etcd,handsomesun/etcd,plasticbox/etcd,honeyqa/etcd,buaazp/etcd,joshix/etcd,improbable-io/etcd,spacejam/etcd,luxas/etcd,CrazyJvm/etcd,qqsun8819/etcd,svdata/etcd,jlamillan/etcd,asim/etcd,betawaffle/etcd,xdlinear/etcd,joshix/etcd,Yhgenomics/etcd,fanminshi/etcd,OyTao/etcd_learning,fasaxc/etcd,mike-lerch/etcd,purpleidea/etcd,yyljlyy/etcd,chenbaihu/etcd,sofuture/etcd,siddontang/etcd,sayden/etcd,hongbinz/etcd,bdarnell/etcd,hongchaodeng/etcd,wowsoso/etcd