[SRU wily,trusty] LP#1540586 -- hv_set_ifconfig brokeness

[Andy Whitcroft]

We have a whole raft of issues in our hv_set_ifconfig script (which is used
by the kv_kvp_daemon to configure networking as requested by the host).
Not least of which is that we totally misshandle the netmask parameter
which leads to broken networking where the netmask does not match the
default.

Following this email are three patches which bring the state of this
script up to that used in Xenial.  This script has been tested by the
original reporter on Trusty and Wily.  This is all all applied to Xenial.
The second patch in the sequence is an automated reindent patch and
contains no functional change; python3 is much more picky about indentation
in particular to tab/space mixes which this script was full.

Proposing this for SRU to Trusty and Wily.

It should be noted that our azure images do not use this mechanism to
configure networking so they should not be affected by any fallout from
this change.  Though it would be prudent to request cloud testing with
the kernel which has this applied when it hits -proposed.

-apw