BTS: ignore other RSL messages in function f_TC_paging()

Recent changes [1] to osmo-bts make it periodically send the
RF RESource INDication messages for each transceiver over the
A-bis/RSL.  These messages block the queue of 'RSL_CCHAN' port
and make the paging related test cases fail.  Ignore them.

Change-Id: I18b879235c6eefb2dd89a3f4502b0830efeac6bb
Related: [1] Id80fdbef087de625149755165c025c0a9563dc85
Related: SYS#5313, OS#1569
diff --git a/bts/BTS_Tests.ttcn b/bts/BTS_Tests.ttcn
index ee5258c..547ada2 100644
--- a/bts/BTS_Tests.ttcn
+++ b/bts/BTS_Tests.ttcn
@@ -3597,6 +3597,8 @@
 			/* FIXME: analyze/verify interval + contents */
 			repeat;
 			}
+		/* ignore other RSL messages like RF RESource INDication */
+		[] RSL_CCHAN.receive { repeat; }
 		/* check if paging requests arrive on Um side */
 		[] as_l1_count_paging(st.num_paging_rcv_msgs, st.num_paging_rcv_ids, cfg);
 		[] L1CTL.receive { repeat; }
@@ -3645,6 +3647,8 @@
 	/* 65535 == empty paging queue, we can terminate*/
 	[] RSL_CCHAN.receive(tr_ASP_RSL_UD(tr_RSL_PAGING_LOAD_IND(65535))) { }
 	[] RSL_CCHAN.receive(tr_ASP_RSL_UD(tr_RSL_PAGING_LOAD_IND)) { repeat; }
+	/* ignore other RSL messages like RF RESource INDication */
+	[] RSL_CCHAN.receive { repeat; }
 	[] T_wait.timeout {
 		Misc_Helpers.f_shutdown(__BFILE__, __LINE__, fail, "Waiting for empty paging queue");
 		}