LAPDm: Re-structure: Merge Frame type A+B which are really the same

A is B with zero-length payload.  No need to separate them.

Change-Id: I7b3079899f42a61d67be03e3a17346af80d7b3be
diff --git a/lapdm/L1CTL_Test.ttcn b/lapdm/L1CTL_Test.ttcn
index 98dc43b..97704ac 100644
--- a/lapdm/L1CTL_Test.ttcn
+++ b/lapdm/L1CTL_Test.ttcn
@@ -45,9 +45,9 @@
 	}
 	/* template for a valid SABM frame */
 	template LapdmFrame LAPDm_B_SABM(template GsmSapi sapi, octetstring payload)  := {
-		b := {
+		ab := {
 			addr := tr_LapdmAddr(sapi, false),
-			ctrl := t_LapdmCtrlSABM(true),
+			ctrl := tr_LapdmCtrlSABM(true),
 			len := lengthof(payload),
 			m := false,
 			el := 1,
@@ -57,9 +57,9 @@
 
 	/* template for a valid UA frame */
 	template LapdmFrame tr_LAPDm_B_UA(template GsmSapi sapi, template octetstring payload)  := {
-		b := {
+		ab := {
 			addr := tr_LapdmAddr(sapi, false),
-			ctrl := t_LapdmCtrlUA(true),
+			ctrl := tr_LapdmCtrlUA(true),
 			len := ?,
 			m := false,
 			el := 1,
@@ -69,9 +69,9 @@
 
 	/* template for a valid UA frame */
 	template LapdmFrame LAPDm_B_UA(template GsmSapi sapi, octetstring payload)  := {
-		b := {
+		ab := {
 			addr := tr_LapdmAddr(sapi, false),
-			ctrl := t_LapdmCtrlUA(true),
+			ctrl := tr_LapdmCtrlUA(true),
 			len := lengthof(payload),
 			m := false,
 			el := 1,
@@ -81,9 +81,9 @@
 
 	/* template for a valid UI frame */
 	template LapdmFrame LAPDm_B_UI(template GsmSapi sapi, octetstring payload)  := {
-		b := {
+		ab := {
 			addr := tr_LapdmAddr(sapi, true),
-			ctrl := t_LapdmCtrlUI(false),
+			ctrl := tr_LapdmCtrlUI(false),
 			len := lengthof(payload),
 			m := false,
 			el := 1,
@@ -92,7 +92,7 @@
 	}
 
 	template LapdmFrame t_nopayload(template GsmSapi sapi) := {
-		b := {
+		ab := {
 			addr := tr_LapdmAddr(sapi, true),
 			ctrl := ?,
 			len := 0,
@@ -103,14 +103,14 @@
 	}
 
 	template LapdmFrame LAPDm_B_DISC(template GsmSapi sapi) modifies t_nopayload := {
-		b := {
-			ctrl := t_LapdmCtrlDISC(true)
+		ab := {
+			ctrl := tr_LapdmCtrlDISC(true)
 		}
 	}
 
 	template LapdmFrame LAPDm_B_RR(template GsmSapi sapi, template uint3_t nr) modifies t_nopayload := {
-		b := {
-			ctrl := t_LapdmCtrlRR(nr, false)
+		ab := {
+			ctrl := tr_LapdmCtrlRR(nr, false)
 		}
 	}
 
@@ -232,12 +232,12 @@
 		log("DEC UI CU: ", dec_LapdmCtrlU('03'O));
 		log("DEC UI CT: ", dec_LapdmCtrl('03'O));
 
-		log("DEC UA: ", dec_LapdmFrameB('017301'O));
-		log("DEC UI: ", dec_LapdmFrameA('030301'O));
-		log("DEC I: ", dec_LapdmFrameA('030001'O));
-		log("DEC S: ", dec_LapdmFrameA('030101'O));
-		log("DEC: ", dec_LapdmFrameB('030301'O));
-		log("DEC: ", dec_LapdmFrameB('0303012B2B2B2B2B2B2B2B2B2B2B2B2B2B2B2B2B2B2B2B'O));
+		log("DEC UA: ", dec_LapdmFrameAB('017301'O));
+		log("DEC UI: ", dec_LapdmFrameAB('030301'O));
+		log("DEC I: ", dec_LapdmFrameAB('030001'O));
+		log("DEC S: ", dec_LapdmFrameAB('030101'O));
+		log("DEC: ", dec_LapdmFrameAB('030301'O));
+		log("DEC: ", dec_LapdmFrameAB('0303012B2B2B2B2B2B2B2B2B2B2B2B2B2B2B2B2B2B2B2B'O));
 	}
 
 	control {