gbproxy: Enable TC_load_sharing_dl based on modulepar; set that in FR test

Change-Id: I96e8b6a1a69148f770476e87c920dc256c1d7379
Related: OS#4520
diff --git a/gbproxy/GBProxy_Tests.ttcn b/gbproxy/GBProxy_Tests.ttcn
index 01bcb9a..d6c8bb1 100644
--- a/gbproxy/GBProxy_Tests.ttcn
+++ b/gbproxy/GBProxy_Tests.ttcn
@@ -44,6 +44,7 @@
 const integer max_fr_info_size := 1600;
 
 modulepar {
+	boolean mp_enable_bss_load_sharing := false;
 	/* SGSN NS configuration */
 	NSConfigurations mp_nsconfig_sgsn := {
 		{
@@ -2291,7 +2292,7 @@
 	execute( TC_bvc_reset_sig_from_bss() );
 	execute( TC_bvc_reset_ptp_from_sgsn() );
 	execute( TC_bvc_reset_sig_from_sgsn() );
-	if (false) {
+	if (mp_enable_bss_load_sharing) {
 		/* don't enable this by default, as we don't yet have any automatic test setup for FR with 4 NS-VC */
 		execute( TC_load_sharing_dl() );
 	}