Fix wbinfo --group-info if the winbind separator set to non \

In getgrsid_lookupsid_recv() we use parse_domain_user which itself looks at
lp_winbind_separator(). Thus when building up that group name we should better
use it as well.

WHATSNEW.txt

@@ -292,6 +292,7 @@ o   Volker Lendecke <vl@samba.org>
     * Make winbind use NetSamLogonEx when possible.
     * Merge fixes in the 3-0-ctdb cluster code.
     * Fix a segfault in snprintf replacement code.
+    * Fix a regression for wbinfo --group-info if winbind separator is set
 
 
 o   Derrell Lipman <derrell@samba.org>

source/winbindd/winbindd_group.c

@@ -806,8 +806,10 @@ static void getgrsid_lookupsid_recv( void *private_data, bool success,
 }
 
 	if ( (s->group_name = talloc_asprintf( s->state->mem_ctx, 
-					       "%s\\%s", 
-					       dom_name, name )) == NULL )
+                                               "%s%c%s",
+                                               dom_name,
+					       *lp_winbind_separator(),
+                                               name)) == NULL )
 {
 		DEBUG(1, ("getgrsid_lookupsid_recv: talloc_asprintf() Failed!\n"));
 		request_error(s->state);