Notify the user when proto_client opens or saves a cookie jar
Notify the user when proto_client opens or saves a cookie jar

This way the user knows which file we are storing their
authentication tokens into, in case they want to rm it,
or are just curious how we know who they are.

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

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