[SRU Wily] CVEs batch for Wily (CVE-2015-7799 CVE-2015-7872 CVE-2015-7884 CVE-2015-7885)

[Andy Whitcroft]

This batch for fixes for Wily are fixes for the CVEs below:

    CVE-2015-7799
    CVE-2015-7872
    CVE-2015-7884
    CVE-2015-7885

I am including this set together as they represent a shortfall for the
_current_ SRU cycle.  Representing all the CVEs which are currently
fixed in older releases and in xenial.  Currently you can be protected
and upgrade and lose that protection.

Proposing for SRU to wily.

-apw