Update 2.9 release notes to mention fixes from 2.8.6
Update 2.9 release notes to mention fixes from 2.8.6

The 2.9 release will include the fixes done in 2.8.6.

Change-Id: I78269f691a335551ba5821a68c3d9afbeeafc167
thinkernel/gerrit,gcoders/gerrit,WANdisco/gerrit,thesamet/gerrit,Team-OctOS/host_gerrit,Overruler/gerrit,joshuawilson/merrit,gcoders/gerrit,supriyantomaftuh/gerrit,midnightradio/gerrit,GerritCodeReview/gerrit,joshuawilson/merrit,Overruler/gerrit,TonyChai24/test,supriyantomaftuh/gerrit,pkdevbox/gerrit,dwhipstock/gerrit,qtproject/qtqa-gerrit,GerritCodeReview/gerrit,Team-OctOS/host_gerrit,GerritCodeReview/gerrit,TonyChai24/test,qtproject/qtqa-gerrit,anminhsu/gerrit,TonyChai24/test,qtproject/qtqa-gerrit,gerrit-review/gerrit,pkdevbox/gerrit,Overruler/gerrit,Distrotech/gerrit,thinkernel/gerrit,gerrit-review/gerrit,Distrotech/gerrit,supriyantomaftuh/gerrit,pkdevbox/gerrit,dwhipstock/gerrit,hdost/gerrit,gerrit-review/gerrit,WANdisco/gerrit,gerrit-review/gerrit,TonyChai24/test,jackminicloud/test,gerrit-review/gerrit,quyixia/gerrit,WANdisco/gerrit,hdost/gerrit,joshuawilson/merrit,Distrotech/gerrit,quyixia/gerrit,thesamet/gerrit,Team-OctOS/host_gerrit,pkdevbox/gerrit,gerrit-review/gerrit,thinkernel/gerrit,hdost/gerrit,joshuawilson/merrit,supriyantomaftuh/gerrit,Saulis/gerrit,Seinlin/gerrit,thesamet/gerrit,pkdevbox/gerrit,thesamet/gerrit,thinkernel/gerrit,renchaorevee/gerrit,thesamet/gerrit,Overruler/gerrit,Seinlin/gerrit,renchaorevee/gerrit,MerritCR/merrit,midnightradio/gerrit,MerritCR/merrit,WANdisco/gerrit,jackminicloud/test,netroby/gerrit,gcoders/gerrit,GerritCodeReview/gerrit,supriyantomaftuh/gerrit,Team-OctOS/host_gerrit,netroby/gerrit,Overruler/gerrit,thesamet/gerrit,WANdisco/gerrit,thesamet/gerrit,Distrotech/gerrit,jackminicloud/test,GerritCodeReview/gerrit,Seinlin/gerrit,dwhipstock/gerrit,jackminicloud/test,Saulis/gerrit,renchaorevee/gerrit,gcoders/gerrit,quyixia/gerrit,GerritCodeReview/gerrit,anminhsu/gerrit,quyixia/gerrit,anminhsu/gerrit,qtproject/qtqa-gerrit,supriyantomaftuh/gerrit,joshuawilson/merrit,quyixia/gerrit,Distrotech/gerrit,Team-OctOS/host_gerrit,joshuawilson/merrit,anminhsu/gerrit,jackminicloud/test,netroby/gerrit,Team-OctOS/host_gerrit,hdost/gerrit,Seinlin/gerrit,Distrotech/gerrit,qtproject/qtqa-gerrit,joshuawilson/merrit,renchaorevee/gerrit,Saulis/gerrit,midnightradio/gerrit,thinkernel/gerrit,netroby/gerrit,hdost/gerrit,gcoders/gerrit,Seinlin/gerrit,renchaorevee/gerrit,netroby/gerrit,jackminicloud/test,Saulis/gerrit,anminhsu/gerrit,gcoders/gerrit,TonyChai24/test,thinkernel/gerrit,anminhsu/gerrit,Saulis/gerrit,gerrit-review/gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,dwhipstock/gerrit,qtproject/qtqa-gerrit,renchaorevee/gerrit,quyixia/gerrit,WANdisco/gerrit,dwhipstock/gerrit,WANdisco/gerrit,pkdevbox/gerrit,Seinlin/gerrit,joshuawilson/merrit,dwhipstock/gerrit,MerritCR/merrit,Team-OctOS/host_gerrit,Saulis/gerrit,quyixia/gerrit,supriyantomaftuh/gerrit,MerritCR/merrit,netroby/gerrit,MerritCR/merrit,MerritCR/merrit,MerritCR/merrit,thinkernel/gerrit,jackminicloud/test,midnightradio/gerrit,dwhipstock/gerrit,hdost/gerrit,midnightradio/gerrit,Seinlin/gerrit,hdost/gerrit,TonyChai24/test,Overruler/gerrit,midnightradio/gerrit,netroby/gerrit,gcoders/gerrit,qtproject/qtqa-gerrit,MerritCR/merrit,Distrotech/gerrit,TonyChai24/test,anminhsu/gerrit,pkdevbox/gerrit,renchaorevee/gerrit