ROADMAP: make 'release-3.2' stable branch
ROADMAP: make 'release-3.2' stable branch

Signed-off-by: Gyu-Ho Lee <3454051ee3341eb69bdf6fca40899cdad4d86496@gmail.com>

coreos/etcd,ajityagaty/etcd,heyitsanthony/etcd,YuleiXiao/etcd,dannysauer/etcd,lorneli/etcd,gyuho/etcd,mqliang/etcd,rnaveiras/etcd,bdarnell/etcd,joshix/etcd,sinsharat/etcd,armstrongli/etcd,cockroachdb/etcd,sebrandon1/etcd,fanminshi/etcd,bluebreezecf/etcd,akauppi/etcd,li-ang/etcd,dannysauer/etcd,fanminshi/etcd,cockroachdb/etcd,heyitsanthony/etcd,etcd-io/etcd,coreos/etcd,visheshnp/etcd,glevand/coreos--etcd,vimalk78/etcd,ajityagaty/etcd,YuleiXiao/etcd,xiang90/etcd,gyuho/etcd,sinsharat/etcd,glevand/coreos--etcd,etcd-io/etcd,rnaveiras/etcd,mickep76/etcd,mqliang/etcd,mkumatag/etcd,joshix/etcd,whuwxl/etcd,li-ang/etcd,mqliang/etcd,akauppi/etcd,etcd-io/etcd,vimalk78/etcd,mkumatag/etcd,rnaveiras/etcd,mickep76/etcd,bluebreezecf/etcd,visheshnp/etcd,sebrandon1/etcd,a-robinson/etcd,bdarnell/etcd,whuwxl/etcd,armstrongli/etcd,mkumatag/etcd,a-robinson/etcd,lorneli/etcd,ajityagaty/etcd,xiang90/etcd