The resource tree needs to represent both API ACLs as well as
chaincodes.

This CR renames the Resource message to APIResource and adds a
collection of Chaincode messages for defining the chaincode group.

For the new Chaincode group, there is now a structure of:

[Group] Resources
    [Group] Chaincodes
        [Group] mycc
            [Value] ChaincodeIdentifier
                bytes hash = 1;
                string version = 2;
            [Value] ChaincodeValidation
                string name = 1;     // Set to vscc
                bytes argument  = 2; // A marshaled:
                    message VSCCArgs
                        string endorsement_policy_ref = 1;
            [Value] ChaincodeEndorsement
                string name = 1; // Set to escc

Change-Id: Ic2d02fb11a55779031eedce898902bc67185a4aa
Signed-off-by: Jason Yellick <jyellick@us.ibm.com>