res_ari: Add "module loaded" check to ari stubs

The recent change to make the use of LOAD_DECLINE more consistent
caused res_ari to unload itself before declining if the ari.conf
file wasn't found.  The ari stubs though still tried to use the
configuration resulting in segfaults.

This patch creates a new CHECK_ARI_MODULE_LOADED macro which tests
to see if res_ari is actually loaded and causes the stubs to also
decline if it isn't.  The macro was then added to the mustache
template's "load_module" function.

ASTERISK-27026 #close
Reported-by: Ronald Raikes

Change-Id: I263d56efa628ee3c411bdcd16d49af6260c6c91d

res/res_ari_endpoints.c

@@ -457,6 +457,10 @@ static int unload_module(void)
 static int load_module(void)
 {
 	int res = 0;
+
+	CHECK_ARI_MODULE_LOADED();
+
+
 	stasis_app_ref();
 	res |= ast_ari_add_handler(&endpoints);
 	if (res) {