[FAB-9748] cc handler support to retrieve capabilities

This change set enables the chaincode handler to retrieve application
capabilities.

Change-Id: I19aeb6a8a690964f27774f9339c965948151489d
Signed-off-by: Alessandro Sorniotti <ale.linux@sopit.net>
Signed-off-by: Matthias Neugschwandtner <eug@zurich.ibm.com>