(QE-725) Update install_from_ezbake.

Updates to fix bugs in conditionally_clone and install_from_ezbake.

Don't want to add user to system from install_from_ezbake, that should be done
at a higher level or from within a preinst step if absolutely necessary. Also
shouldn't be making any puppet calls using Beaker before the Puppet master is
run for the first time using init scripts since this will lead to
/var/lib/puppet directories being owned by root. Bad.

Signed-off-by: Wayne <wayne@puppetlabs.com>
(QE-725) Adds spec tests for EZBakeUtils.

Signed-off-by: Wayne <wayne@puppetlabs.com>