Outbound SIP OPTIONS messages will now include fromuser of related peer.

This behavior matches up more closely with the way invite/register/etc are handled.
This patch also modifies some adjacent code for code style compliance.  Pretty minor.

(closes issue ASTERISK-17616)
Reported by: Jeremy Kister
Patches:
     chan_sip.c-options-fromuser-fix-v1.patch uploaded by Jeremy Kister (license #6232)
........

Merged revisions 342061 from http://svn.asterisk.org/svn/asterisk/branches/1.8


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/10@342062 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -26348,13 +26348,19 @@ static int sip_poke_peer(struct sip_peer *peer, int force)
 	ast_copy_flags(&p->flags[2], &peer->flags[2], SIP_PAGE3_FLAGS_TO_COPY);
 
 	/* Send OPTIONs to peer's fullcontact */
-	if (!ast_strlen_zero(peer->fullcontact))
+	if (!ast_strlen_zero(peer->fullcontact)) {
 		ast_string_field_set(p, fullcontact, peer->fullcontact);
+	}
+
+	if (!ast_strlen_zero(peer->fromuser)) {
+		ast_string_field_set(p, fromuser, peer->fromuser);
+	}
 
-	if (!ast_strlen_zero(peer->tohost))
+	if (!ast_strlen_zero(peer->tohost)) {
 		ast_string_field_set(p, tohost, peer->tohost);
-	else
+	} else {
 		ast_string_field_set(p, tohost, ast_sockaddr_stringify_host_remote(&peer->addr));
+	}
 
 	/* Recalculate our side, and recalculate Call ID */
 	ast_sip_ouraddrfor(&p->sa, &p->ourip, p);