SERVER-26577 Fix permissions for listCollections getMore.

Squashed commit of the following:

commit 11c363b941e99fc288c4f9a19cb807442fb09d44
Author: Justin Seyster <justin.seyster@mongodb.com>
Date:   Fri Apr 21 17:59:23 2017 -0400

    SERVER-26577 JS test for listCollections_getMore authorization

commit fa3e01205995ad4fd139e3d4fe77c407c2409aa0
Author: Justin Seyster <justin.seyster@mongodb.com>
Date:   Thu Apr 20 15:10:49 2017 -0400

    SERVER-26577 Unit tests for isAuthorizedToListCollections

commit 53cea2802850f221b492e5469d8da659bd1f6694
Author: Justin Seyster <justin.seyster@mongodb.com>
Date:   Wed Apr 19 17:16:51 2017 -0400

    SERVER-26577 Permissions checks for listCollections go to one function

1 files changed, 1 insertions, 7 deletions

diff --git a/src/mongo/db/commands/list_collections.cpp b/src/mongo/db/commands/list_collections.cpp
index b58ff9339fd..e9038a46cfd 100644
--- a/src/mongo/db/commands/list_collections.cpp
+++ b/src/mongo/db/commands/list_collections.cpp
@@ -208,13 +208,7 @@ public:
                                        const BSONObj& cmdObj) {
         AuthorizationSession* authzSession = AuthorizationSession::get(client);
 
-        // Check for the listCollections ActionType on the database
-        // or find on system.namespaces for pre 3.0 systems.
-        if (authzSession->isAuthorizedForActionsOnResource(ResourcePattern::forDatabaseName(dbname),
-                                                           ActionType::listCollections) ||
-            authzSession->isAuthorizedForActionsOnResource(
-                ResourcePattern::forExactNamespace(NamespaceString(dbname, "system.namespaces")),
-                ActionType::find)) {
+        if (authzSession->isAuthorizedToListCollections(dbname)) {
             return Status::OK();
         }