Updated openstack/openstack
Project: openstack/neutron  c5169571bd6ebfadaf9fb61757efdcdaa24fd01b

extensions: remove 'check_env' method

The method is not documented or used.
It was introduced for quota but unused since commit 603e3b78.

Closes-Bug: #1328362
Change-Id: Id0a4d8606f34e54468ed0de26adbf25ff273079e