beta: New script to restart apaches

Introduce a new utility script that wraps the proper salt command to
send start|stop|restart|graceful messages to the MediaWiki apache hosts in the
beta cluster. This script is provisioned by a new
beta::saltmaster::tools puppet class that can be used to deploy
additional scripts of a similar nature as they are found to be needed.

Bug: 36422
Change-Id: Ia351ef7e997c3acc4a4d44b1c5e757bfc838a2cb
Merge "beta: New script to restart apaches" into production