(mix)monitor: Add options to enable a periodic beep

Add an option to enable a periodic beep to be played into a call if it
is being recorded.  If enabled, it uses the PERIODIC_HOOK() function
internally to play the 'beep' prompt into the call at a specified
interval.  This option is provided for both Monitor() and
MixMonitor().

Review: https://reviewboard.asterisk.org/r/3424/


git-svn-id: http://svn.asterisk.org/svn/asterisk/trunk@412427 f38db490-d61c-443f-a65b-d21fe96a405b