[Skiboot] [PATCH] travis-ci: use Docker containers for a matrix of platforms

[Stewart Smith]

Stewart Smith <stewart at linux.vnet.ibm.com> writes:
> This greatly simplifies the build process for travis, yet makes it more
> powerful and increases coverage without increasing wall time to test.
>
> Travis has the concept of a build matrix, and we want to ensure we continue
> to build succesfully on a variety of platforms and compiler combinations.
>
> We limit what we run on some OSs to conserve vital sanity.
>
> Signed-off-by: Stewart Smith <stewart at linux.vnet.ibm.com>

As suggested by Joel on IRC, using 14.04 for trusty rather than the
name. Merged to master as of 99f146145c49e960af6e7da9391908cb30617227.

Let's see if it breaks Coverity :)

-- 
Stewart Smith
OPAL Architect, IBM.