Only check for clean repos when not (--force or --reset).
Only check for clean repos when not (--force or --reset).

This allows cache_dir to be enabled on bots when the individual repo path has
changes (like android_tools, which has a bunch of generated, non-ignored .h
files)

R=agable@chromium.org, szager@chromium.org
BUG=

Review URL: https://codereview.chromium.org/488273003

git-svn-id: fd409f4bdeea2bb50a5d34bb4d4bfc2046a5a3dd@290943 0039d316-1c4b-4281-b951-d872f2087c98

sarvex/depot-tools,G-P-S/depot_tools,eatbyte/depot_tools,liaorubei/depot_tools,azunite/chrome_build,xuyuhan/depot_tools,michalliu/chromium-depot_tools,cpanelli/-git-clone-https-chromium.googlesource.com-chromium-tools-depot_tools,SuYiling/chrome_depot_tools,SuYiling/chrome_depot_tools,Midrya/chromium,SuYiling/chrome_depot_tools,duanwujie/depot_tools,ajohnson23/depot_tools,michalliu/chromium-depot_tools,G-P-S/depot_tools,npe9/depot_tools,aleonliao/depot_tools,chinmaygarde/depot_tools,disigma/depot_tools,HackFisher/depot_tools,ajohnson23/depot_tools,chinmaygarde/depot_tools,xuyuhan/depot_tools,HackFisher/depot_tools,primiano/depot_tools,CoherentLabs/depot_tools,hsharsha/depot_tools,duanwujie/depot_tools,duongbaoduy/gtools,Midrya/chromium,azunite/chrome_build,duongbaoduy/gtools,Phonebooth/depot_tools,disigma/depot_tools,npe9/depot_tools,hsharsha/depot_tools,npe9/depot_tools,Phonebooth/depot_tools,eatbyte/depot_tools,michalliu/chromium-depot_tools,sarvex/depot-tools,gcodetogit/depot_tools,CoherentLabs/depot_tools,fracting/depot_tools,azureplus/chromium_depot_tools,hsharsha/depot_tools,azureplus/chromium_depot_tools,G-P-S/depot_tools,sarvex/depot-tools,liaorubei/depot_tools,mlufei/depot_tools,eatbyte/depot_tools,HackFisher/depot_tools,ajohnson23/depot_tools,xuyuhan/depot_tools,airtimemedia/depot_tools,Phonebooth/depot_tools,liaorubei/depot_tools,withtone/depot_tools,aleonliao/depot_tools,kaiix/depot_tools,withtone/depot_tools,gcodetogit/depot_tools,airtimemedia/depot_tools,azunite/chrome_build,fanjunwei/depot_tools,disigma/depot_tools,azureplus/chromium_depot_tools,fanjunwei/depot_tools,Phonebooth/depot_tools,primiano/depot_tools,mlufei/depot_tools,cpanelli/-git-clone-https-chromium.googlesource.com-chromium-tools-depot_tools,duanwujie/depot_tools,aleonliao/depot_tools,airtimemedia/depot_tools,withtone/depot_tools,fracting/depot_tools,cpanelli/-git-clone-https-chromium.googlesource.com-chromium-tools-depot_tools,fanjunwei/depot_tools,fanjunwei/depot_tools,duongbaoduy/gtools,airtimemedia/depot_tools,G-P-S/depot_tools,eatbyte/depot_tools,chinmaygarde/depot_tools,gcodetogit/depot_tools,liaorubei/depot_tools,michalliu/chromium-depot_tools,mlufei/depot_tools,primiano/depot_tools,npe9/depot_tools,kaiix/depot_tools,kaiix/depot_tools,sarvex/depot-tools,HackFisher/depot_tools,Midrya/chromium,xuyuhan/depot_tools,fracting/depot_tools