mpls: Add --allow-unsupported for modprobe

In SLE-Micro we encounter following error when do modprobe:

    # modprobe mpls_router
    modprobe: ERROR: module 'mpls_router' is unsupported
    modprobe: ERROR: Use --allow-unsupported or set allow_unsupported_modules 1 in
    modprobe: ERROR: /etc/modprobe.d/10-unsupported-modules.conf
    modprobe: ERROR: could not insert 'mpls_router': Operation not permitted

Therefore enable --allow-unsupported for SLE, SLE-Micro and openSUSE
Tumbleweed (here it's noop).

Link: https://lore.kernel.org/ltp/20240904065653.31086-1-wegao@suse.com/
Reviewed-by: Petr Vorel <pvorel@suse.cz>
Acked-by: Cyril Hrubis <chrubis@suse.cz>
Signed-off-by: Wei Gao <wegao@suse.com>

testcases/network/mpls/mpls01.sh

@@ -21,7 +21,7 @@ cleanup()
 
 setup()
 {
-	ROD modprobe mpls_router
+	mpls_setup_driver
 }
 
 test1()
@@ -66,5 +66,5 @@ test3()
 	tst_res TPASS "created and removed mpls routes"
 }
 
-. tst_net.sh
+. mpls_lib.sh
 tst_run

testcases/network/mpls/mpls_lib.sh

@@ -33,11 +33,21 @@ mpls_virt_cleanup()
 	mpls_cleanup
 }
 
+mpls_setup_driver()
+{
+	local args
+
+	grep -q -w ID_LIKE.*suse /etc/os-release && args='--allow-unsupported'
+	if [ "$TST_NEEDS_DRIVERS" ]; then
+		tst_net_run -s "modprobe $args -a $TST_NEEDS_DRIVERS"
+	fi
+}
+
 mpls_setup()
 {
 	local label="$1"
 
-	tst_net_run -s "modprobe -a $TST_NEEDS_DRIVERS"
+	mpls_setup_driver
 
 	ROD sysctl -q net.mpls.conf.$(tst_iface).input=1
 	tst_set_sysctl net.mpls.conf.lo.input 1 safe