Three new Ndbinfo views added :

 - locks_per_fragment

   Companion table to operations_per_fragment and memory_per_fragment.
   Keyed in a similar way.
   Shows counts of lock claim requests, and their outcomes per
   fragment.  Shows total time spent waiting for locks successfully
   and unsuccessfully.

 - cluster_locks

   Companion table to cluster_operations.
   Keyed in a similar way.
   Shows current lock requests holding and waiting for locks.
   Allows stalls and deadlocks to be investigated.

 - server_locks

   Companion table to server_operations.
   Keyed in a similar way.
   Essentially a subset of cluster_operations, for transactions
   running on the local MySQLD, showing a connection id per
   transaction.

The two tables are based on two underlying tables
  - ndb$frag_locks (locks_per_fragment)
  - ndb$acc_operations (cluster_locks, server_locks)

Three new testcases added :
  - ndbinfo_locks_per_fragment
  - ndbinfo_cluster_locks
  - ndbinfo_server_locks