Update lockutils and fixture in openstack.common

lockutils: included commits:
  8b2b0b7 Use hacking import_exceptions for gettextutils._
  6d0a6c3 Correct invalid docstrings
  12bcdb7 Remove vim header
  79e6bc6 fix lockutils.lock() to make it thread-safe
  ace5120 Add main() to lockutils that creates temp dir for locks
  537d8e2 Allow lockutils to get lock_path conf from envvar
  371fa42 Move LockFixture into a fixtures module
  d498c42 Fix to properly log when we release a semaphore
  29d387c Add LockFixture to lockutils
  3e3ac0c Modify lockutils.py due to dispose of eventlet
  90b6a65 Fix locking bug
  27d4b41 Move synchronized body to a first-class function
  15c17fb Make lock_file_prefix optional
  1a2df89 Enable H302 hacking check

fixture: created, included commits:
  45658e2 Fix violations of H302:import only modules
  12bcdb7 Remove vim header
  3970d46 Fix typos in oslo
  371fa42 Move LockFixture into a fixtures module
  f4a4855 Consolidate the use of stubs
  6111131 Make openstack.common.fixture.config Py3 compliant
  3906979 Add a fixture for dealing with config
  d332cca Add a fixture for dealing with mock patching.
  1bc3ecf Start adding reusable test fixtures.

Also tox.ini was corrected to let lockutils work in tests.

This change is needed for work on bp: db-sync-models-with-migrations

Closes-Bug: #1065531

Change-Id: I139f30b4767ff2c9d1f01ee728823859c09b3859
Fix mistake in usage drop_constraint parameters

In migration e197124d4b9_add_unique_constrain mistake in usage
drop_constraint parameter type_ and positional arguments name
and table_name.

The same mistake was already fixed in migration
63afba73813_ovs_tunnelendpoints_id_unique.

Change-Id: I6a250e55ea53048bb11afd71fecf94da6f0c7421
Closes-bug: #1257607
Merge "Fix mistake in usage drop_constraint parameters"
Merge "Update lockutils and fixture in openstack.common"