Voicemail: Remove mailbox identifier format (box@context) assumptions in the system.

This change is in preparation for external MWI support.

Removed code from the system for normal mailbox handling that appends
@default to the mailbox identifier if it does not have a context.  The
only exception is the legacy hasvoicemail users.conf option.  The legacy
option will only work for app_voicemail mailboxes.  The system cannot make
any assumptions about the format of the mailbox identifer used by
app_voicemail.

chan_sip and chan_dahdi/sig_pri had the most changes because they both
tried to interpret the mailbox identifier.  chan_sip just stored and
compared the two components.  chan_dahdi actually used the box
information.

The ISDN MWI support configuration options had to be reworked because
chan_dahdi was parsing the box@context format to get the box number.  As a
result the mwi_vm_boxes chan_dahdi.conf option was added and is documented
in the chan_dahdi.conf.sample file.

Review: https://reviewboard.asterisk.org/r/3072/
........

Merged revisions 404348 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@404350 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/sip/include/sip.h

@@ -1232,7 +1232,7 @@ struct sip_pkt {
 /*!
  * \brief A peer's mailbox
  *
- * We could use STRINGFIELDS here, but for only two strings, it seems like
+ * We could use STRINGFIELDS here, but for only one string, its
  * too much effort ...
  */
 struct sip_mailbox {
@@ -1240,8 +1240,7 @@ struct sip_mailbox {
 	struct stasis_subscription *event_sub;
 	AST_LIST_ENTRY(sip_mailbox) entry;
 	unsigned int delme:1;
-	char *context;
-	char mailbox[2];
+	char id[1];
 };
 
 /*! \brief Structure for SIP peer data, we place calls to peers if registered  or fixed IP address (host)