update pyloxi to floodlight/loxigen-artifacts @ b44eb26cc919f8bd61d0da059163a1a7dce088de

Pulls in OF 1.4.
Merge into master from pull request #149:
update pyloxi to floodlight/loxigen-artifacts @ b44eb26cc919f8bd61d0da059163a1a7dce088de (https://github.com/floodlight/oftest/pull/149)