SERVER-2442: clean up listCollections

Author: erh

src/mongo/db/auth/role_graph_builtin_roles.cpp

@@ -115,6 +115,7 @@ namespace {
             << ActionType::dbStats
             << ActionType::find
             << ActionType::killCursors
+            << ActionType::listCollections
             << ActionType::planCacheRead;
 
         // Read-write role

src/mongo/db/commands/list_databases.cpp

@@ -78,7 +78,7 @@ namespace mongo {
                 totalSize += size;
 
                 {
-                    Client::ReadContext rc(txn, *i + ".system.namespaces");
+                    Client::ReadContext rc(txn, *i );
                     b.appendBool( "empty", rc.ctx().db()->getDatabaseCatalogEntry()->isEmpty() );
                 }