mod_callcenter: Alot of cleanup.  Added max-wait-time and max-wait-time-with-no-agent param to a queue.

max-wait-time : allow to make the caller quit the queue after X number of waited second.  The second one allow
max-wait-time-with-no-agent : This will wait for a range of second with no agent before kicking the member out of the queue.  This allow safe shift change with all agents login out and back in

I've changed the Event value from CC-Name to either CC-Agent or CC-Queue.  So watchout for your current event socket apps.  Sorry about this change.

Lot to be tested in this commit.  Please use Jira to post problems, and new feature request can be added at the bottom of the wiki page.

- enhance conf/skinny_profiles/internal.xml
- Sanity checks
  + softKeySet id < 16
  + less than 16 buttons per softKeySet
  + at least the default soft-key-set to load the profile
  + at least one profile to load mod_skinny
- Lower some ERRORs to WARNINGs as they don't prevent module loading
- Default skinny_str2soft_key_event to 0

mod_callcenter: Make more sence to bridge the caller to the agent.  Before, in the xml_cdr you saw it it like the agent initiated the call to the member

- Respawn only if ip or port is changed
- Properly handle timeout

non-blocking mode can still be used by setting MOD_SKINNY_NONBLOCK

         we need to check each time for TERMINATING state since set_state
	 function needs to unlock to allow sig mod to handle the state change