SERVER-12908 don't aggressively retry when config inconsistency detected in balancer

Author: Greg Studer

src/mongo/s/balance.cpp

@@ -467,6 +467,7 @@ namespace mongo {
                         conn.done();
                         warning() << "Skipping balancing round because data inconsistency"
                                   << " was detected amongst the config servers." << endl;
+                        sleepsecs( sleepTime );
                         continue;
                     }