Issues: Install test does not test validity of packages (rpm/deb)

Fixes F5Networks#494

Problem:
The test install algorithm to work with a more generic pool

Analysis:
I made the changes to make it so that the .deb and .rpm install tests
would do what they're supposed to do.  Before this change, the .deb and
.rpm failures were not being properly tracked and would always fail due
to improper regExp handling of expected strings.

Tests:
This is a test.  To validate that this executes properly, use the
.travis_yml file in its normal execution phasing.

f5-openstack-agent-dist/Docker/ubuntu/install_test/Dockerfile.trusty

@@ -5,8 +5,6 @@ COPY ./fetch_and_install_deps.py /
 RUN apt-get update -y && apt-get install software-properties-common -y
 RUN apt-add-repository cloud-archive:liberty
 RUN apt-get update -y && apt-get dist-upgrade -y --force-yes
-RUN apt-add-repository cloud-archive:mitaka
-RUN apt-get update -y
 RUN apt-get install python-requests git curl -y --force-yes
 RUN apt-get install python-six
 RUN chmod 700 /fetch_and_install_deps.py