Drop mox - no longer needed

The porting of designate-dashboard is complete.
This fullfills the community goal
"Remove Use of mox/mox3 for Testing" set for Rocky:
https://governance.openstack.org/tc/goals/rocky/mox_removal.html

Raise the requirement to the Rocky #2 release of horizon,
which drops the mox usgae by default (it should be explicitly
enabled) Without a forced import from Horizon the mox dependencies
can be dropped here.
Bump also a dependency needed by this new version of Horizon.

Change-Id: I2ceaf8bae9b20829ec4855cf79635aa805be1984
Signed-off-by: Chuck Short <chucks@redhat.com>

designatedashboard/tests/base.py

@@ -31,7 +31,6 @@ _TRUE_VALUES = ('True', 'true', '1', 'yes')
 class TestCase(testtools.TestCase):
 
     """Test case base class for all unit tests."""
-    use_mox = False
 
     def setUp(self):
         """Run before each test method to initialize test environment."""
@@ -63,7 +62,6 @@ class BaseRecordFormCleanTests(test.TestCase):
 
     DOMAIN_NAME = 'foo.com.'
     HOSTNAME = 'www'
-    use_mox = False
 
     MSG_FIELD_REQUIRED = 'This field is required'
     MSG_INVALID_HOSTNAME = 'Enter a valid hostname. The '\

lower-constraints.txt

@@ -46,7 +46,6 @@ MarkupSafe==1.0
 mccabe==0.2.1
 mock==2.0.0
 monotonic==1.4
-mox3==0.20.0
 msgpack==0.5.6
 munch==2.2.0
 netaddr==0.7.19

requirements.txt

@@ -6,4 +6,4 @@ pbr!=2.1.0,>=2.0.0 # Apache-2.0
 Babel!=2.4.0,>=2.3.4 # BSD
 python-designateclient>=2.7.0 # Apache-2.0
 
-horizon>=14.0.0.0b1 # Apache-2.0
+horizon>=14.0.0.0b2 # Apache-2.0