upgrade_net_proto: allow input files already in new proto format
upgrade_net_proto: allow input files already in new proto format

audtlr24/caffe,wangg12/caffe,vibhav-vineet/caffe,vibhav-vineet/caffe,dculibrk/boosted_pooling,minghuam/caffe,xidianwlc/caffe,minghuam/caffe,shuimulinxi/caffe,naeluh/caffe,gnina/gnina,bharath272/sds_eccv2014,longjon/caffe,audtlr24/caffe,xidianwlc/caffe,gogartom/caffe-textmaps,audtlr24/caffe,flickr/caffe,flickr/caffe,yikeliu/caffe-future,niuzhiheng/caffe,CZCV/s-dilation-caffe,yikeliu/caffe-future,sichenucsd/caffe_si,MoskalenkoViktor/caffe,tackgeun/caffe,MoskalenkoViktor/caffe,dylansun/caffe,wangg12/caffe,dculibrk/boosted_pooling,shiquanwang/caffe,flickr/caffe,vibhav-vineet/caffe,minghuam/caffe,orentadmor/caffe,minghuam/caffe,shiquanwang/caffe,yikeliu/caffe-future,naeluh/caffe,pcoving/caffe,longjon/caffe,pcoving/caffe,audtlr24/caffe,dylansun/caffe,gnina/gnina,nicodjimenez/caffe,Hilovaiserillis/caffe,MoskalenkoViktor/caffe,liuxianming/caffe_feedback,CVML/sds_eccv2014,niuzhiheng/caffe,sichenucsd/caffe_si,vibhav-vineet/caffe,naeluh/caffe,Hilovaiserillis/caffe,suixudongi8/caffe,liuxianming/caffe_feedback,suixudongi8/caffe,suixudongi8/caffe,dylansun/caffe,dculibrk/boosted_pooling,sichenucsd/caffe_si,shiquanwang/caffe,pcoving/caffe,dculibrk/boosted_pooling,gnina/gnina,shiquanwang/caffe,shuimulinxi/caffe,tackgeun/caffe,liuxianming/caffe_feedback,longjon/caffe,Hilovaiserillis/caffe,naeluh/caffe,gnina/gnina,nicodjimenez/caffe,pcoving/caffe,wangg12/caffe,flickr/caffe,liuxianming/caffe_feedback,pcoving/caffe,shuimulinxi/caffe,audtlr24/caffe,gogartom/caffe-textmaps,Hilovaiserillis/caffe,orentadmor/caffe,orentadmor/caffe,CZCV/s-dilation-caffe,xidianwlc/caffe,niuzhiheng/caffe,nicodjimenez/caffe,gnina/gnina,nicodjimenez/caffe,longjon/caffe,CZCV/s-dilation-caffe,gnina/gnina,dylansun/caffe,shuimulinxi/caffe,dculibrk/boosted_pooling,tackgeun/caffe,gogartom/caffe-textmaps,MoskalenkoViktor/caffe,nicodjimenez/caffe,CZCV/s-dilation-caffe,xidianwlc/caffe,naeluh/caffe,shuimulinxi/caffe,gogartom/caffe-textmaps,niuzhiheng/caffe,tackgeun/caffe,liuxianming/caffe_feedback,sichenucsd/caffe_si,wangg12/caffe,MoskalenkoViktor/caffe,niuzhiheng/caffe,Hilovaiserillis/caffe,flickr/caffe,dylansun/caffe,suixudongi8/caffe,orentadmor/caffe,yikeliu/caffe-future