This CR moves the information about the system chaincode, ie whether it
is invokable cc2cc, etc. into the system chaincode itself.  Although
this should probably be done across the board, it leaves the plugin
system chaincode wrapped for the time being for compatibility purposes.

Change-Id: I9e166440e341c91da3f1828e798a0ba70571f319
Signed-off-by: Jason Yellick <jyellick@us.ibm.com>