Nachi Ueno 6769b166b1 Added functions for get a ip on an instance
The cause of some gating failure looks like
because of getting ip address on instance.
However current exercise didn't log the return value.
In this commit, we add get_instance_ip function with
error hanlding support, and apply it on the execise.

Change-Id: I8e17ba68093faafe58a98eb780a032368eea38aa
2013-08-13 17:08:47 -07:00
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