Bug 1530: Limit IP addresses

Adds an exit to the awk command so that only the first IP address is used on
a system that might have more than one IP address on the chosen interface

Fixes bug 1530

Change-Id: I7d5775ed1c1e801a338e048576d5106dc6c3d23a
Signed-off-by: beierlm <mark.beierl@canonical.com>