squash! rflib: Introduce TLV, Match, Action Types for Python

Bugfix: Pad integers to appropriate length when dealing with binary form
squash! rfserver: Replace DatapathConfig with RouteMod

Bugfix: Misc fatal DatapathConfig->RouteMod related bugs in rfserver
squash! rflib: Introduce TLV, Match, Action Types for Python

Added default netmask for creating an IPv4 Match - 255.255.255.255
squash! rfserver: Add support for RouteMod structure

Minor bugfix: Consistent naming - vmid -> vm_id