Add support for an easy way to automatically execute some Asterisk CLI commands

immediately at startup.  Any commands in the startup_commands file in the Asterisk
config diretory will get executed.

(closes issue #11781)
Reported by: jamesgolovich
Patches:
      asterisk-startupcmds.diff.txt uploaded by jamesgolovich (license 176)
	    -- With some changes by me.


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@98986 65c4cc65-6c06-0410-ace0-fbb531ad65f3