integration: use structured logging in peer handler
integration: use structured logging in peer handler

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

sebrandon1/etcd,dannysauer/etcd,glevand/coreos--etcd,ajityagaty/etcd,mqliang/etcd,rnaveiras/etcd,mqliang/etcd,mkumatag/etcd,ajityagaty/etcd,vimalk78/etcd,glevand/coreos--etcd,sebrandon1/etcd,cockroachdb/etcd,sinsharat/etcd,rnaveiras/etcd,cockroachdb/etcd,xiang90/etcd,etcd-io/etcd,gyuho/etcd,sinsharat/etcd,ajityagaty/etcd,mkumatag/etcd,etcd-io/etcd,joshix/etcd,joshix/etcd,xiang90/etcd,coreos/etcd,gyuho/etcd,bdarnell/etcd,li-ang/etcd,li-ang/etcd,mqliang/etcd,dannysauer/etcd,vimalk78/etcd,coreos/etcd,rnaveiras/etcd,mkumatag/etcd,etcd-io/etcd,bdarnell/etcd