sync: Continue job if some fetchs failed but force-broken is set
sync: Continue job if some fetchs failed but force-broken is set

With --force-broken it continue to fetch other projects but nothing
is added in directory because it abort some lines later.

Change-Id: I32c4a4619b3028893dc4f98e8d4e5bc5c09adb27

lewixliu/git-repo,lewixliu/git-repo,codetutil/git-repo,wavecomp/git-repo,lipro-yocto/git-repo,couchbasedeps/git-repo,aosp-mirror/tools_repo,mer-tools/git-repo,gabbayo/git-repo,GerritCodeReview/git-repo,couchbasedeps/git-repo,mer-tools/git-repo,TheQtCompany/git-repo,lipro-yocto/git-repo,nuclearmistake/repo,GerritCodeReview/git-repo,gabbayo/git-repo,TheQtCompany/git-repo,wavecomp/git-repo,nuclearmistake/repo,chenzilin/git-repo,aosp-mirror/tools_repo,chenzilin/git-repo,codetutil/git-repo