assigned-uniqueids: Miscellaneous cleanup and fixes.

* Fix memory leak in ast_unreal_new_channels().  Made it generate the ;2
uniqueid on a stack variable instead of mallocing it.

* Made send error response to ARI and AMI requests instead of just logging
excessive uniqueid length and allowing truncation.  action_originate() and
ari_channels_handle_originate_with_id().

* Fixed minor truncating uniqueid hole when generating the ;2 uniqueid
string length.  Created public and internal lengths of uniqueid.  The
internal length can handle a max public uniqueid plus an appended ;2.

* free() and ast_free() are NULL tolerant so they don't need a NULL test
before calling.

* Made use better struct initialization format instead of the position
dependent initialization format.  Also anything not explicitly initialized
in the struct is initialized to zero by the compiler.

* Made ast_channel_internal_set_fake_ids() use the safer
ast_copy_string() instead of strncpy().

Review: https://reviewboard.asterisk.org/r/3371/


git-svn-id: http://svn.asterisk.org/svn/asterisk/branches/12@410949 f38db490-d61c-443f-a65b-d21fe96a405b
app_confbridge: Fix bug - users with startmuted set don't start muted

(closes issue ASTERISK-23461)
Reported by: Chico Manobela
Review: https://reviewboard.asterisk.org/r/3373/
........

Merged revisions 410965 from http://svn.asterisk.org/svn/asterisk/branches/11


git-svn-id: http://svn.asterisk.org/svn/asterisk/branches/12@410966 f38db490-d61c-443f-a65b-d21fe96a405b