integration: enable client debug logging on EXPECT_DEBUG
integration: enable client debug logging on EXPECT_DEBUG

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

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