Test: cts: Drop [--]install/--inst option from cts script

This simply duplicates functionality from Ansible, Puppet, pssh, and
other such tools for config management/orchestration/parallel execution,
by installing certain packages on all nodes in a group.

Additionally, it relies on yum, which is not available on all systems.
This dependency was undocumented.

Signed-off-by: Reid Wahl <nrwahl@protonmail.com>