chan_sip.c: AMI & CLI notify methods get different values of asterisk's own ip.

When I ask asterisk to send a SIP NOTIFY message to a sip peer using either a)
AMI action: SIPnotify or b) cli command: sip notify <cmd> <peer>, I expect
asterisk to include the same value for its own ip in both cases a) and b),
but it seems a) produces a contact header like Contact:
<sip:asterisk@192.168.1.227:8060> whereas b) produces a contact header like
<sip:asterisk@127.0.0.1:8060>. 0.0.0.0:8060 is my udpbindaddr in sip.conf

My guess is that manager_sipnotify should call
ast_sip_ouraddrfor(&p->sa, &p->ourip, p) the same way sip_cli_notify does,
because after applying this patch, both cases a) and b) produce
the contact header that I expect: <sip:asterisk@192.168.1.227:8060>

Reported by: Stefan Engström
Tested by: Stefan Engström

Change-Id: I86af5e209db64aab82c25417de6c768fb645f476

channels/chan_sip.c

@@ -15160,6 +15160,12 @@ static int manager_sipnotify(struct mansession *s, const struct message *m)
 		}
 	}
 
+	/* Now that we have the peer's address, set our ip and change callid */
+	ast_sip_ouraddrfor(&p->sa, &p->ourip, p);
+	build_via(p);
+
+	change_callid_pvt(p, NULL);
+
 	sip_scheddestroy(p, SIP_TRANS_TIMEOUT);
 	transmit_invite(p, SIP_NOTIFY, 0, 2, NULL);
 	dialog_unref(p, "bump down the count of p since we're done with it.");