Log iptables rules when they fail to apply

Log the set of rules that causes iptables-restore
to fail in the Linux agent iptables manager.

If a specific rule is identified as the cause, only
that rule and a few surrounding it will be logged to
reduce the output.

Closes-Bug: #1306399
Change-Id: I8e94c1faae75760e439c5abe3d9b723548398105
Merge "Log iptables rules when they fail to apply"