Resolve object matching issues related to the removal of the sip_user object.

Previously, chan_sip had both sip_peer and sip_user objects in memory.  A
patch went in to remove sip_user to simplify the code, since everything
could be done with just sip_peer.  This patch resolves some regressions
found that were introduced by those changes.

This code comes from svn/asterisk/team/group/sip-object-matching/.

Here is a list of the changes that have been made:

1) When doing a match by name with the find_peer() function, make it much
   easier to specify which objects should be matched by having a parameter
   that specifies exactly which object types should be considered.  Also,
   update find_by_name() to handle this parameter.  Finally, update all
   code to use the new option values.

2) When looking up an object for an outbound request by name, consider
   peers only.  (create_addr())

3) Only match peers on an incoming registration request.

4) When doing authentication (except for SUBSCRIBE), look up users
   by name, instead of all objects by name.
   
5) When doing authentication (except for SUBSCRIBE), after looking for
   a user by name, look for a peer by IP address, instead of all objects
   by IP address.

6) When handling the SIP qualify CLI command or manager action, look for
   a peer by name, instead of any object by name.

7) When handling the SIP unregister CLI command, look for a peer by name,
   instead of any object by name.

9) In sip_do_debug_peer(), search for a peer by name, instead of any object
   by name.

9) When handling the SIPPEER() dialplan function, search for a peer by name,
   instead of any object by name.

10) In the following session timer related functions, st_get_se(),
    st_get_refresher(), and st_get_mode(), when looking for an object for a
    given sip_pvt using pvt->peername, look for a peer by name, instead of any
    object by name.

11) Fix build_peer() to properly handle the case where separate type=peer and
    type=user entries were specified in sip.conf.

(closes issue #14505)
Reported by: lmadsen

Review: http://reviewboard.digium.com/r/172/


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@180261 65c4cc65-6c06-0410-ace0-fbb531ad65f3

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