Change implementation of cleanup in case of clone failure during "repo init"
Change implementation of cleanup in case of clone failure during "repo init"

Fix includes:
1. It deletes only .repo/repo instead of the whole .repo repository.

Bug: Issue 161
Change-Id: I1ab8caa7538fec5e6206d1b029f63bd3f60dedcd

mixedpuppy/git-repo,daimajia/git-repo,mozilla/git-repo,lightsofapollo/git-repo,venus-solar/git-repo,dodocat/git-repo,IbpTeam/repo,mixedpuppy/git-repo,jingyu/git-repo,nuclearmistake/repo,FlymeOS/repo,nuclearmistake/repo,frogbywyplay/git-repo,derron/git-repo,windyan/git-repo,frogbywyplay/git-repo,petemoore/git-repo,qupai/git-repo,kangear/git-repo,biaolv/git-repo,zemug/repo,chzhong/git-repo,CyanogenMod/tools_repo,wavecomp/git-repo,lightsofapollo/git-repo,zemug/repo,FuangCao/repo,ronan22/repo,chenzilin/git-repo,gabbayo/git-repo,4455jkjh/repo,aosp-mirror/tools_repo,qioixiy/git-repo,flingone/git-repo,GatorQue/git-repo-flow,xecle/git-repo,ChronoMonochrome/repo,gbraad/git-repo,gbraad/git-repo,chzhong/git-repo,kdavis-mozilla/repo-repo,iAlios/git-repo,mer-tools/git-repo,flingone/git-repo,kdavis-mozilla/repo-repo,ronan22/repo,hacker-camp/google_repo,wzhy90/git-repo,linuxdeepin/git-repo,darrengarvey/git-repo,DavidPu/git-repo,codetutil/git-repo,gabbayo/git-repo,TheQtCompany/git-repo,darrengarvey/git-repo,FlymeOS/repo,derron/git-repo,hisilicon/git-repo,venus-solar/git-repo,xin3liang/git-repo,ChronoMonochrome/repo,TheQtCompany/git-repo,lewixliu/git-repo,xyyangkun/git-repo,jingyu/git-repo,11NJ/git-repo,daimajia/git-repo,slfyusufu/repo,windyan/git-repo,simbasailor/git-repo,chenzilin/git-repo,qupai/git-repo,11NJ/git-repo,ediTLJ/git-repo,GerritCodeReview/git-repo,GerritCodeReview/git-repo,testbetta/repo-pub,llg84/google_repo,testbetta/repo-pub,petemoore/git-repo,mer-tools/git-repo,xecle/git-repo,4455jkjh/repo,xyyangkun/git-repo,GatorQue/git-repo-flow,couchbasedeps/git-repo,dodocat/git-repo,demonyangyue/git-repo,kangear/git-repo,hacker-camp/google_repo,demonyangyue/git-repo,FuangCao/git-repo,lewixliu/git-repo,mozilla/git-repo,testbetta/git-repo-pub,llg84/google_repo,lipro-yocto/git-repo,linuxdeepin/git-repo,biaolv/git-repo,hisilicon/git-repo,codetutil/git-repo,wavecomp/git-repo,IbpTeam/repo,DavidPu/git-repo,aosp-mirror/tools_repo,iAlios/git-repo,testbetta/git-repo-pub,lipro-yocto/git-repo,couchbasedeps/git-repo,ediTLJ/git-repo,xin3liang/git-repo,wzhy90/git-repo,qioixiy/git-repo,slfyusufu/repo,FuangCao/git-repo,RuanJG/git-repo,CyanogenMod/tools_repo,FuangCao/repo,RuanJG/git-repo,simbasailor/git-repo