datapaths: Fix a number of vlan actions
Merge pull request #74 from nbjsw/vlan

datapaths: Fix a number of vlan actions

Co-authored-by: Murphy McCauley <murphy.mccauley@gmail.com>
libopenflow: Add aliases for VLAN rewrite actions
datapaths: More fixes to VLAN ID rewrite action

This now has actually been tested and confirmed to work.