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
Disallow 'timeout' in health_monitor to be negative

It should limit the value of 'timeout' in 'health_monitor', the 'timeout'
shouldn't to be negative.

Change-Id: I26ae1995c9cc362df7c7dda4c53fb8adda298d13
Closes-bug: #1320062
Merge "Disallow 'timeout' in health_monitor to be negative"
Merge "Log iptables rules when they fail to apply"