Don't append duplicate Verified-by or Tested-by lines
Don't append duplicate Verified-by or Tested-by lines

If there were already Verified-by or Tested-by lines inside of the
original commit message, don't duplicate them if the user has used
Gerrit to also provide that same approval flag.  This permits the
committer to cherry-pick a change from one branch to another, and
then ask the original reviewers to re-review the cherry-pick, without
needing to worry about getting duplicate (and pointless) remarks.

Signed-off-by: Shawn O. Pearce <f3ea74d906fa9fe97c1fef6bad9cb871485c7045@google.com>

hdost/gerrit,TonyChai24/test,qtproject/qtqa-gerrit,atdt/gerrit,GerritCodeReview/gerrit-attic,Distrotech/gerrit,rtyley/mini-git-server,CandyShop/gerrit,WANdisco/gerrit,WANdisco/gerrit,sudosurootdev/gerrit,ckamm/gerrit,gracefullife/gerrit,basilgor/gerrit,gerrit-review/gerrit,midnightradio/gerrit,joshuawilson/merrit,zommarin/gerrit,jeblair/gerrit,GerritCodeReview/gerrit,ashang/aaron-gerrit,jeblair/gerrit,cjh1/gerrit,renchaorevee/gerrit,cjh1/gerrit,renchaorevee/gerrit,austinchic/Gerrit,bpollack/gerrit,1yvT0s/gerrit,joshuawilson/merrit,jackminicloud/test,GerritCodeReview/gerrit,sudosurootdev/gerrit,Distrotech/gerrit,joshuawilson/merrit,midnightradio/gerrit,thinkernel/gerrit,quyixia/gerrit,Overruler/gerrit,Team-OctOS/host_gerrit,Seinlin/gerrit,makholm/gerrit-ceremony,Distrotech/gerrit,MerritCR/merrit,dwhipstock/gerrit,renchaorevee/gerrit,catrope/gerrit,quyixia/gerrit,austinchic/Gerrit,pkdevbox/gerrit,GerritCodeReview/gerrit,quyixia/gerrit,Overruler/gerrit,ashang/aaron-gerrit,Distrotech/gerrit,1yvT0s/gerrit,zommarin/gerrit,teamblueridge/gerrit,thesamet/gerrit,Saulis/gerrit,GerritCodeReview/gerrit,dwhipstock/gerrit,bootstraponline-archive/gerrit-mirror,teamblueridge/gerrit,supriyantomaftuh/gerrit,anminhsu/gerrit,skurfuerst/gerrit,gcoders/gerrit,joshuawilson/merrit,joshuawilson/merrit,supriyantomaftuh/gerrit,bootstraponline-archive/gerrit-mirror,thesamet/gerrit,Seinlin/gerrit,rtyley/mini-git-server,Saulis/gerrit,hdost/gerrit,Overruler/gerrit,Team-OctOS/host_gerrit,makholm/gerrit-ceremony,gracefullife/gerrit,gerrit-review/gerrit,midnightradio/gerrit,dwhipstock/gerrit,gracefullife/gerrit,anminhsu/gerrit,duboisf/gerrit,netroby/gerrit,keerath/gerrit_newssh,teamblueridge/gerrit,Distrotech/gerrit,gcoders/gerrit,evanchueng/gerrit,gcoders/gerrit,bpollack/gerrit,WANdisco/gerrit,netroby/gerrit,bootstraponline-archive/gerrit-mirror,TonyChai24/test,ashang/aaron-gerrit,joshuawilson/merrit,duboisf/gerrit,makholm/gerrit-ceremony,qtproject/qtqa-gerrit,keerath/gerrit_newssh,GerritCodeReview/gerrit,anminhsu/gerrit,netroby/gerrit,thinkernel/gerrit,Team-OctOS/host_gerrit,thesamet/gerrit,catrope/gerrit,joshuawilson/merrit,TonyChai24/test,Saulis/gerrit,Overruler/gerrit,dwhipstock/gerrit,zommarin/gerrit,ashang/aaron-gerrit,ashang/aaron-gerrit,Team-OctOS/host_gerrit,keerath/gerrit_newssh,MerritCR/merrit,TonyChai24/test,quyixia/gerrit,jackminicloud/test,Seinlin/gerrit,atdt/gerrit,GerritCodeReview/gerrit-attic,jackminicloud/test,Saulis/gerrit,GerritCodeReview/gerrit-attic,GerritCodeReview/gerrit,atdt/gerrit,thinkernel/gerrit,CandyShop/gerrit,gerrit-review/gerrit,austinchic/Gerrit,anminhsu/gerrit,thesamet/gerrit,dwhipstock/gerrit,anminhsu/gerrit,gcoders/gerrit,gerrit-review/gerrit,Saulis/gerrit,quyixia/gerrit,zommarin/gerrit,m1kah/gerrit-contributions,gracefullife/gerrit,Team-OctOS/host_gerrit,CandyShop/gerrit,bootstraponline-archive/gerrit-mirror,dwhipstock/gerrit,netroby/gerrit,thesamet/gerrit,CandyShop/gerrit,duboisf/gerrit,renchaorevee/gerrit,basilgor/gerrit,atdt/gerrit,supriyantomaftuh/gerrit,gcoders/gerrit,sudosurootdev/gerrit,m1kah/gerrit-contributions,MerritCR/merrit,renchaorevee/gerrit,anminhsu/gerrit,gcoders/gerrit,Seinlin/gerrit,MerritCR/merrit,CandyShop/gerrit,pkdevbox/gerrit,supriyantomaftuh/gerrit,catrope/gerrit,sudosurootdev/gerrit,skurfuerst/gerrit,TonyChai24/test,Seinlin/gerrit,ckamm/gerrit,quyixia/gerrit,bpollack/gerrit,atdt/gerrit,gerrit-review/gerrit,qtproject/qtqa-gerrit,Team-OctOS/host_gerrit,qtproject/qtqa-gerrit,bootstraponline-archive/gerrit-mirror,jackminicloud/test,Distrotech/gerrit,1yvT0s/gerrit,skurfuerst/gerrit,WANdisco/gerrit,pkdevbox/gerrit,evanchueng/gerrit,ckamm/gerrit,TonyChai24/test,pkdevbox/gerrit,midnightradio/gerrit,dwhipstock/gerrit,evanchueng/gerrit,hdost/gerrit,bootstraponline-archive/gerrit-mirror,cjh1/gerrit,WANdisco/gerrit,thesamet/gerrit,Overruler/gerrit,keerath/gerrit_newssh,MerritCR/merrit,bpollack/gerrit,gerrit-review/gerrit,pkdevbox/gerrit,Saulis/gerrit,hdost/gerrit,teamblueridge/gerrit,anminhsu/gerrit,WANdisco/gerrit,netroby/gerrit,makholm/gerrit-ceremony,netroby/gerrit,renchaorevee/gerrit,qtproject/qtqa-gerrit,pkdevbox/gerrit,thesamet/gerrit,supriyantomaftuh/gerrit,Team-OctOS/host_gerrit,gracefullife/gerrit,MerritCR/merrit,basilgor/gerrit,bpollack/gerrit,qtproject/qtqa-gerrit,midnightradio/gerrit,midnightradio/gerrit,austinchic/Gerrit,jackminicloud/test,ckamm/gerrit,Distrotech/gerrit,skurfuerst/gerrit,qtproject/qtqa-gerrit,supriyantomaftuh/gerrit,m1kah/gerrit-contributions,thinkernel/gerrit,duboisf/gerrit,TonyChai24/test,gcoders/gerrit,cjh1/gerrit,jeblair/gerrit,1yvT0s/gerrit,evanchueng/gerrit,jackminicloud/test,hdost/gerrit,m1kah/gerrit-contributions,sudosurootdev/gerrit,1yvT0s/gerrit,supriyantomaftuh/gerrit,renchaorevee/gerrit,Seinlin/gerrit,hdost/gerrit,basilgor/gerrit,quyixia/gerrit,gerrit-review/gerrit,pkdevbox/gerrit,thinkernel/gerrit,Seinlin/gerrit,MerritCR/merrit,hdost/gerrit,jeblair/gerrit,GerritCodeReview/gerrit,evanchueng/gerrit,ckamm/gerrit,Overruler/gerrit,keerath/gerrit_newssh,netroby/gerrit,bpollack/gerrit,basilgor/gerrit,thinkernel/gerrit,joshuawilson/merrit,catrope/gerrit,zommarin/gerrit,jackminicloud/test,GerritCodeReview/gerrit,WANdisco/gerrit,teamblueridge/gerrit,thinkernel/gerrit,MerritCR/merrit