specify running instance
specify running instance

Sometimes the machine doesn't disappear immediately after getting destroyed. This ensures we get only the one machine that is running.

Signed-off-by: Anand Gaitonde <4f0ff06b2390eeadb0769d298cbdb3dc6df4c73d@pivotal.io>

fujitsu-cf/cli,simonleung8/cli,markstgodard/cli,hyenaspots/cli,markstgodard/cli,hyenaspots/cli,hyenaspots/cli,markstgodard/cli,simonleung8/cli,simonleung8/cli,markstgodard/cli,hyenaspots/cli,fujitsu-cf/cli,fujitsu-cf/cli