FAB-9729 Make VMCProcess non-package scoped

The chaincode package has already been reworked to reference the
VMCProcess function as an interface method.  This CR simply modifies the
container package to make the VMCProcess function a method of
VMController and exposes a constructor for creating the VMController.

Change-Id: Ib08e77ece59b30d2564db065197782513c18d6d6
Signed-off-by: Jason Yellick <jyellick@us.ibm.com>