This CR adds a new shim package provider which retrieves the
code package for a given chaincode name/version and updates
the peer to use it at startup. It first searches for a
ChaincodeInstallPackage with the given name/version and falls
back to searching for a ChaincodeDeploymentSpec.

FAB-11201 #done

Change-Id: I064dc2b364a1c8e1280ec1f2b3ffc21c8b3e2e96
Signed-off-by: Will Lahti <wtlahti@us.ibm.com>