2015.5 tweaks from #30529
2015.5 tweaks from #30529

In the process of resolving merge conflicts in the merge-forward of
2015.5 to 2015.8 which I did in #30529, I found two changes that should
have been made in the 2015.5 branch. One was the removal of yum-specific
information in the pkg.remove docstring, and the other was needless use
of -q when deleting a version lock in pkg.unhold. We're not parsing the
output and the default loglevel is debug, so using -q here removes
helpful troubleshooting output from the log.

saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt