FAB-16530 configure agent forwarding in vagrant
FAB-16530 configure agent forwarding in vagrant

This makes it easier to interact with gerrit and github from within the
virtual machine.

Change-Id: I8d1cf197aeee1bedcd91bf4c1ea5525cc44087c1
Signed-off-by: Matthew Sykes <89c6e4c9c1046731a9c37abefc223a83de36a5d9@us.ibm.com>

muralisrini/fabric,binhn/fabric,hyperledger/fabric,muralisrini/fabric,manish-sethi/fabric,manish-sethi/fabric-sidedb,stemlending/fabric,manish-sethi/fabric-sidedb,muralisrini/fabric,manish-sethi/fabric-sidedb,manish-sethi/fabric-sidedb,jimthematrix/fabric,manish-sethi/fabric-sidedb,binhn/fabric,jimthematrix/fabric,manish-sethi/fabric,hyperledger/fabric,stemlending/fabric,stemlending/fabric,manish-sethi/fabric-sidedb,manish-sethi/fabric-sidedb,binhn/fabric,stemlending/fabric