update for havana and icehouse

This patch removes the support of Folsom and Grizzly because those versions
had been obsoleted. Therefore the local patch for devstack was not necessary.

This patch adds support of stable/havana and stable/icehouse in addition to
master branch.
There are following test cases:
  havana-ryu-gre
  havana-ryu-vlan
  icehouse-ryu-gre
  icehouse-ryu-vlan
  icehouse-ofa-gre
  icehouse-ofa-vxlan
  icehouse-ofa-vlan
  master-ofa-gre
  master-ofa-vxlan
  master-ofa-vlan