ndb/include/mgmapi/mgmapi.h:
  Add mgmapi call: ndb_mgm_get_mgmd_nodeid()
  
  - returns the node id that the handle is connected to.
  - returns 0 on error.
ndb/include/transporter/TransporterRegistry.hpp:
  Add TransporterRegistry::connect_client(NdbMgmHandle h)
   - uses a connected NdbMgmHandle to connect to the mgm server as a client.
   - sets up a transporter connection
   - used to transform the initial mgm connection (used for fetching configuration)
     into a transporter connection
  
  Added connect_ndb_mgmd(NdbMgmHandle h)
   - turn the supplied mgm connection into a transporter connection
   - return the socket
  
  Improve comments on connect_ndb_mgmd(SocketClient)
ndb/src/common/transporter/Transporter.cpp:
  Add Transporter::connect_client(NDB_SOCKET_TYPE)
   - use an existing socket to make a transporter connection
ndb/src/common/transporter/Transporter.hpp:
  Add connect_client(NDB_SOCKET_TYPE)
ndb/src/common/transporter/TransporterRegistry.cpp:
  Add TransporterRegistry::connect_client(NdbMgmHandle)
   - use an existing mgm connection to connect a transporter
   - used to change the mgm connection used for fetching configuration into a transporter
  
  Add connect_ndb_mgmd(NdbMgmHandle)
   - use existing NdbMgmHandle
   - convert to transporter
   - return socket
ndb/src/kernel/vm/Configuration.cpp:
  After fetching configuration, use the mgm connection as a transporter.
  Fail fatally if this fails.
ndb/src/mgmapi/mgmapi.cpp:
  Add ndb_mgm_get_mgmd_nodeid(h)
   - returns the node id of the mgm server you're connected to.
ndb/src/mgmsrv/Services.cpp:
  Add "get mgmd nodeid" mgmd call
  
  returns 'nodeid' - the node id of the mgm server your connected to
ndb/src/mgmsrv/Services.hpp:
  add prototype for get_mgmd_nodeid