Don't append duplicate Reviewed-on Gerrit URLs during cherry-pick
Don't append duplicate Reviewed-on Gerrit URLs during cherry-pick

When cherry-picking a change, if the Gerrit URL is already on the
commit message for this server, don't include it a second time.
This case generally shouldn't occur, but if it does, there is no
point in being redundant in the message.

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

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