.travis.yml: add a new build target with non-core devlibs

The current builds don't include all the features which are
auto-detected and then disabled when the appropriate test packages don't
exist. I've added another target that enables all known additional
packages for increased coverage. I didn't add it to the core package
list to reduce build time.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
.travis.yml: re-enable lttng user space trace test

This build was disabled while the lttng tracing was broken. Stefan has
recently submitted a pull request with it re-enabled.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
.travis.yml: trivial whitespace fixup

Purely cosmetic but satisfies my OCD.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
.travis.yml: add IRC notifications for build failures

I'm trying to avoid spamming the IRC channel (not overly likely as
builds take a while). So failure will always be reported but if the
build continues to work then the IRC notifications will be quiet.

Note any GitHub based repository with Travis enabled will use this
notification. If it proves to be too spammy we may want to ask users not
to use Travis themselves although this seems sub-optimal.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>