Update Gerrit 2.6 release notes
Update Gerrit 2.6 release notes

Describe the changes that were merged recently.

Change-Id: I9d95eeef15f03d35f936a2a21c9b5681646f811c
Signed-off-by: Edwin Kempin <b444e279ad95fdef4fbdd82c813b624595df204a@sap.com>

hdost/gerrit,bootstraponline-archive/gerrit-mirror,gerrit-review/gerrit,dwhipstock/gerrit,thinkernel/gerrit,qtproject/qtqa-gerrit,gracefullife/gerrit,renchaorevee/gerrit,MerritCR/merrit,TonyChai24/test,Overruler/gerrit,Saulis/gerrit,Team-OctOS/host_gerrit,Saulis/gerrit,supriyantomaftuh/gerrit,WANdisco/gerrit,midnightradio/gerrit,gerrit-review/gerrit,basilgor/gerrit,thesamet/gerrit,dwhipstock/gerrit,dwhipstock/gerrit,basilgor/gerrit,thinkernel/gerrit,GerritCodeReview/gerrit,jackminicloud/test,MerritCR/merrit,hdost/gerrit,GerritCodeReview/gerrit,jackminicloud/test,thesamet/gerrit,pkdevbox/gerrit,TonyChai24/test,pkdevbox/gerrit,GerritCodeReview/gerrit,Distrotech/gerrit,gerrit-review/gerrit,bpollack/gerrit,bpollack/gerrit,anminhsu/gerrit,dwhipstock/gerrit,joshuawilson/merrit,netroby/gerrit,ckamm/gerrit,quyixia/gerrit,Seinlin/gerrit,pkdevbox/gerrit,gcoders/gerrit,Seinlin/gerrit,ckamm/gerrit,netroby/gerrit,netroby/gerrit,bpollack/gerrit,dwhipstock/gerrit,pkdevbox/gerrit,netroby/gerrit,MerritCR/merrit,gracefullife/gerrit,thinkernel/gerrit,thesamet/gerrit,WANdisco/gerrit,hdost/gerrit,thesamet/gerrit,thinkernel/gerrit,GerritCodeReview/gerrit,gcoders/gerrit,hdost/gerrit,ckamm/gerrit,zommarin/gerrit,thesamet/gerrit,midnightradio/gerrit,quyixia/gerrit,supriyantomaftuh/gerrit,Team-OctOS/host_gerrit,WANdisco/gerrit,Seinlin/gerrit,joshuawilson/merrit,renchaorevee/gerrit,WANdisco/gerrit,basilgor/gerrit,thesamet/gerrit,qtproject/qtqa-gerrit,supriyantomaftuh/gerrit,gerrit-review/gerrit,TonyChai24/test,anminhsu/gerrit,gcoders/gerrit,gcoders/gerrit,quyixia/gerrit,Seinlin/gerrit,bpollack/gerrit,GerritCodeReview/gerrit,qtproject/qtqa-gerrit,Overruler/gerrit,midnightradio/gerrit,qtproject/qtqa-gerrit,zommarin/gerrit,Distrotech/gerrit,gcoders/gerrit,netroby/gerrit,joshuawilson/merrit,thinkernel/gerrit,anminhsu/gerrit,Distrotech/gerrit,quyixia/gerrit,Overruler/gerrit,Distrotech/gerrit,TonyChai24/test,ckamm/gerrit,supriyantomaftuh/gerrit,anminhsu/gerrit,Seinlin/gerrit,thinkernel/gerrit,jackminicloud/test,Overruler/gerrit,Saulis/gerrit,bpollack/gerrit,joshuawilson/merrit,thesamet/gerrit,Distrotech/gerrit,Team-OctOS/host_gerrit,MerritCR/merrit,Seinlin/gerrit,gerrit-review/gerrit,renchaorevee/gerrit,jackminicloud/test,MerritCR/merrit,gcoders/gerrit,Distrotech/gerrit,MerritCR/merrit,jackminicloud/test,qtproject/qtqa-gerrit,gerrit-review/gerrit,anminhsu/gerrit,midnightradio/gerrit,Overruler/gerrit,gracefullife/gerrit,Team-OctOS/host_gerrit,joshuawilson/merrit,zommarin/gerrit,pkdevbox/gerrit,dwhipstock/gerrit,MerritCR/merrit,jackminicloud/test,qtproject/qtqa-gerrit,Team-OctOS/host_gerrit,renchaorevee/gerrit,renchaorevee/gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,jackminicloud/test,renchaorevee/gerrit,renchaorevee/gerrit,supriyantomaftuh/gerrit,hdost/gerrit,basilgor/gerrit,anminhsu/gerrit,supriyantomaftuh/gerrit,hdost/gerrit,WANdisco/gerrit,hdost/gerrit,bpollack/gerrit,WANdisco/gerrit,bootstraponline-archive/gerrit-mirror,qtproject/qtqa-gerrit,bootstraponline-archive/gerrit-mirror,bootstraponline-archive/gerrit-mirror,Team-OctOS/host_gerrit,GerritCodeReview/gerrit,quyixia/gerrit,thinkernel/gerrit,pkdevbox/gerrit,netroby/gerrit,Overruler/gerrit,midnightradio/gerrit,MerritCR/merrit,TonyChai24/test,Team-OctOS/host_gerrit,gracefullife/gerrit,gcoders/gerrit,supriyantomaftuh/gerrit,anminhsu/gerrit,gracefullife/gerrit,bootstraponline-archive/gerrit-mirror,gerrit-review/gerrit,joshuawilson/merrit,zommarin/gerrit,pkdevbox/gerrit,quyixia/gerrit,Saulis/gerrit,dwhipstock/gerrit,joshuawilson/merrit,Seinlin/gerrit,bootstraponline-archive/gerrit-mirror,basilgor/gerrit,Saulis/gerrit,Distrotech/gerrit,TonyChai24/test,zommarin/gerrit,joshuawilson/merrit,ckamm/gerrit,quyixia/gerrit,WANdisco/gerrit,Saulis/gerrit,netroby/gerrit,TonyChai24/test,midnightradio/gerrit