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/redhat/install_test/Dockerfile.centos7

@@ -7,6 +7,6 @@ COPY ./fetch_and_install_deps.py /
 
 RUN chmod 500 /fetch_and_install_deps.py
 
-ENTRYPOINT ["/fetch_and_install_deps", "/var/wdir"]
+ENTRYPOINT ["/fetch_and_install_deps.py", "/var/wdir"]
 # by default, the following will be used for the last execution:
 CMD ["/var/wdir/f5-openstack-agent-dist/rpms/build/f5-openstack-agent-*.el7.noarch.rpm"]