Add autopilot suite and code coverage gating to autopilot MPs

The commands to generate coverage reports for the autopilot unit tests are as follows:

python -m coverage erase
python -m coverage run --branch --include "autopilot/*" -m autopilot.run run autopilot.tests.unit
python -m coverage xml

The first command erases any existing coverage data. If you're running in a clean environment you don't need this (but it can't hurt).
The second command runs the tests, and generates coverage data in an internal data format.
The third and final command writes a file named 'coverage.xml' in the current directory that jenkins should be able to parse.

Let me know if you need anything else.

Actually, those commands should instead be:

python -m coverage erase
python -m coverage run --branch --include "autopilot/*" -m autopilot.run run autopilot.tests.unit
python3 -m coverage run --append --branch --include "autopilot/*" -m autopilot.run run autopilot.tests.unit
python -m coverage xml --omit "autopilot/tests/*"

This will run the python3 unit test suite as well, and will omit test lines from the final coverage report.

Cheers,

Attempts to add the autopilot suite to CI have run into:
https://bugs.launchpad.net/autopilot/+bug/1259721

The bug causes the test runner to hang. So we either need a fix or a special case workaround. A couple of fixes have been proposed, which look promising.

QA team has requested adding the touch testing now (back around March 11). I attempted this here (this is the job chain):
http://s-jenkins.ubuntu-ci:8080/job/generic-mediumtests-touch/3265/
http://s-jenkins.ubuntu-ci:8080/job/generic-mediumtests-builder-saucy-armhf/3267/

This ultimately led to the autopilot armhf build that is attached, but I now see the problem. I linked in the wrong job (note the saucy above :-( )... I should have used generic-mediumtests-trusty-touch.