New release 0.18.0

Breaking changes

• MASSIVE changes to API in order to 1.0 preparation. Please check
  document or code for detail. Sorry for the inconvenience.

New features

• Support HSR interface. (37f9c5c)

Bug fixes

• vxlan: Do not fail on unknown option. (2457bdf)
• bond: Do not fail on unknown option. (acac109)
• vlan: Do not fail on unknown option. (1617948)