Make all linting tests use upper-constraints
Make all linting tests use upper-constraints

As per [1] all linting tests can now use upper-constraints. This patch
removes all instances of the install_command override relating to lint
testing which were needed to negate the use of upper-constraints.

[1] http://lists.openstack.org/pipermail/openstack-dev/2016-August/101474.html

Change-Id: I02066b3659278d63a9a0aa89cf18254eeac2d418

openstack/openstack-ansible-rsyslog_server,openstack/openstack-ansible-rsyslog_server