DUNDi: Add CLI commands DUNDi show cache and DUNDi show hints

(closes issue ASTERISK-18390)
Reported by: Peter Racz
Patches:
	dundi_cli_cache.patch.v2 uploaded by Peter Racz (license #6290)
	ASTERISK-18390_dundi_cli_cache_jrose_mods_v2.diff uploaded by Jonathan Rose (license #6182)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@370978 65c4cc65-6c06-0410-ace0-fbb531ad65f3