trivial: Resolve 'oslo.context' deprecation warnings
trivial: Resolve 'oslo.context' deprecation warnings

Resolve the following deprecation warnings:

  DeprecationWarning: Using the 'user' argument is deprecated in
  version '2.18' and will be removed in version '3.0', please use the
  'user_id' argument instead

  DeprecationWarning: Using the 'tenant' argument is deprecated in
  version '2.18' and will be removed in version '3.0', please use the
  'project_id' argument instead

These were polluting the 'py35' logs in particular.

Change-Id: Id02851dcd86b333b85039e76f1e45e3e49eae908

klmitch/nova,openstack/nova,klmitch/nova,mahak/nova,phenoxim/nova,gooddata/openstack-nova,mahak/nova,mikalstill/nova,mikalstill/nova,gooddata/openstack-nova,rahulunair/nova,mikalstill/nova,openstack/nova,openstack/nova,mahak/nova,gooddata/openstack-nova,klmitch/nova,rahulunair/nova,phenoxim/nova,klmitch/nova,rahulunair/nova,gooddata/openstack-nova