turn: use official PJSIP patch to fix TURN

Commit 0bc5829b has introduced
a patch recently partialy integrated in PJSIP (see [1]).
But it doesn't take in account TURN error during ALLOCATING state.
This patch replace our patch by the PJSIP one and modify it
to handle the ALLOCATING case.

[1] https://trac.pjsip.org/repos/changeset/5465



Change-Id: Ic45458609e11b55641f13c3e6294eeda599d304e
Reviewed-by: Stepan Salenikovich <stepan.salenikovich@savoirfairelinux.com>

contrib/src/pjproject/fix_turn_fallback.patch

@@ -13,27 +13,41 @@
 +			continue;
 +
  	    /* Gather remote addresses for this component */
-@@ -2013,4 +2016,21 @@
- 	    if (comp->ice_st->state < PJ_ICE_STRANS_STATE_READY) {
--		sess_fail(comp->ice_st, PJ_ICE_STRANS_OP_INIT,
--			  "TURN allocation failed", info.last_status);
-+			PJ_LOG(4,(comp->ice_st->obj_name,
-+					  "TURN allocation failed, disable the associated candidate"));
+@@ -1995,4 +1998,37 @@
+         sess_init_update(comp->ice_st);
+
++    } else if ((old_state == PJ_TURN_STATE_RESOLVING || old_state == PJ_TURN_STATE_ALLOCATING) &&
++               new_state >= PJ_TURN_STATE_DEALLOCATING)
++    {
 +        pj_ice_sess_cand *cand = NULL;
 +        unsigned i;
++
++        /* DNS resolution has failed! */
++        ++comp->turn[tp_idx].err_cnt;
++
++        /* Unregister ourself from the TURN relay */
++        pj_turn_sock_set_user_data(turn_sock, NULL);
++        comp->turn[tp_idx].sock = NULL;
++
 +        /* Wait until initialization completes */
 +        pj_grp_lock_acquire(comp->ice_st->grp_lock);
++
 +        /* Find relayed candidate in the component */
 +        for (i=0; i<comp->cand_cnt; ++i) {
 +            if (comp->cand_list[i].type == PJ_ICE_CAND_TYPE_RELAYED &&
-+					comp->cand_list[i].transport_id == data->transport_id) {
++                comp->cand_list[i].transport_id == data->transport_id)
++            {
 +                cand = &comp->cand_list[i];
 +                break;
 +            }
 +        }
-+			pj_grp_lock_release(comp->ice_st->grp_lock);
 +        pj_assert(cand != NULL);
-+			// Make session init succeed but disable this TURN server to be used
-+			cand->status = PJNATH_ESTUNTIMEDOUT;
++
++        pj_grp_lock_release(comp->ice_st->grp_lock);
++
++        cand->status = old_state == PJ_TURN_STATE_RESOLVING ? PJ_ERESOLVE : PJ_EINVALIDOP;
++
 +        sess_init_update(comp->ice_st);
- 	    } else if (comp->turn[tp_idx].err_cnt > 1) {
++
+     } else if (new_state >= PJ_TURN_STATE_DEALLOCATING) {
+         pj_turn_session_info info;