Added GetConfigTree and SimulateConfigTreeUpdate verbs
to the configuration system chaincode.

Change-Id: I43cff8078c956b2ed73611f0cd6c8d4acb57f904
Signed-off-by: Anil Ambati <aambati@us.ibm.com>
Signed-off-by: yacovm <yacovm@il.ibm.com>