main_test: skip test when invoked via go test
main_test: skip test when invoked via go test

Signed-off-by: Gyuho Lee <0fbd30d364d71722b926950b451cecd97b54fc29@amazon.com>

etcd-io/etcd,rnaveiras/etcd,ajityagaty/etcd,mkumatag/etcd,rnaveiras/etcd,etcd-io/etcd,mqliang/etcd,ajityagaty/etcd,dannysauer/etcd,cockroachdb/etcd,gyuho/etcd,mqliang/etcd,mqliang/etcd,dannysauer/etcd,coreos/etcd,ajityagaty/etcd,gyuho/etcd,li-ang/etcd,mkumatag/etcd,coreos/etcd,li-ang/etcd,mkumatag/etcd,cockroachdb/etcd,rnaveiras/etcd,etcd-io/etcd