Fix git describe for plugins in 'buck test'
Fix git describe for plugins in 'buck test'

which was broken by change If5e7be8d.

Change-Id: Iac6d12a975074581d3cc2f5c8d451b6c00e1bba0

thesamet/gerrit,MerritCR/merrit,GerritCodeReview/gerrit,pkdevbox/gerrit,joshuawilson/merrit,jackminicloud/test,MerritCR/merrit,gerrit-review/gerrit,WANdisco/gerrit,GerritCodeReview/gerrit,pkdevbox/gerrit,WANdisco/gerrit,thesamet/gerrit,thesamet/gerrit,Seinlin/gerrit,supriyantomaftuh/gerrit,MerritCR/merrit,jackminicloud/test,supriyantomaftuh/gerrit,Seinlin/gerrit,MerritCR/merrit,MerritCR/merrit,pkdevbox/gerrit,hdost/gerrit,gerrit-review/gerrit,GerritCodeReview/gerrit,supriyantomaftuh/gerrit,qtproject/qtqa-gerrit,renchaorevee/gerrit,gerrit-review/gerrit,thesamet/gerrit,netroby/gerrit,quyixia/gerrit,GerritCodeReview/gerrit,hdost/gerrit,quyixia/gerrit,hdost/gerrit,jackminicloud/test,hdost/gerrit,GerritCodeReview/gerrit,joshuawilson/merrit,hdost/gerrit,GerritCodeReview/gerrit,netroby/gerrit,joshuawilson/merrit,joshuawilson/merrit,quyixia/gerrit,hdost/gerrit,pkdevbox/gerrit,WANdisco/gerrit,quyixia/gerrit,thesamet/gerrit,TonyChai24/test,joshuawilson/merrit,netroby/gerrit,gerrit-review/gerrit,Seinlin/gerrit,joshuawilson/merrit,qtproject/qtqa-gerrit,gerrit-review/gerrit,supriyantomaftuh/gerrit,jackminicloud/test,MerritCR/merrit,TonyChai24/test,joshuawilson/merrit,pkdevbox/gerrit,WANdisco/gerrit,jackminicloud/test,qtproject/qtqa-gerrit,jackminicloud/test,Distrotech/gerrit,WANdisco/gerrit,qtproject/qtqa-gerrit,supriyantomaftuh/gerrit,hdost/gerrit,supriyantomaftuh/gerrit,TonyChai24/test,TonyChai24/test,Distrotech/gerrit,gerrit-review/gerrit,qtproject/qtqa-gerrit,pkdevbox/gerrit,renchaorevee/gerrit,pkdevbox/gerrit,renchaorevee/gerrit,renchaorevee/gerrit,quyixia/gerrit,gerrit-review/gerrit,netroby/gerrit,Seinlin/gerrit,Distrotech/gerrit,Seinlin/gerrit,netroby/gerrit,GerritCodeReview/gerrit,qtproject/qtqa-gerrit,netroby/gerrit,WANdisco/gerrit,thesamet/gerrit,Distrotech/gerrit,quyixia/gerrit,thesamet/gerrit,TonyChai24/test,MerritCR/merrit,supriyantomaftuh/gerrit,TonyChai24/test,netroby/gerrit,renchaorevee/gerrit,Distrotech/gerrit,renchaorevee/gerrit,renchaorevee/gerrit,Distrotech/gerrit,qtproject/qtqa-gerrit,WANdisco/gerrit,jackminicloud/test,Distrotech/gerrit,TonyChai24/test,Seinlin/gerrit,MerritCR/merrit,joshuawilson/merrit,GerritCodeReview/gerrit,quyixia/gerrit,Seinlin/gerrit