functional-tester/agent: add TODO for proxy TLS
functional-tester/agent: add TODO for proxy TLS

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

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