Remove mock from lower-constraints

This packages is only needed  for python2.x.

Change-Id: I729d9c6482ab604d31f74ecdae0c33eaa16efb34

.zuul.yaml

@@ -1,7 +1,7 @@
 - project:
     templates:
       - openstack-python3-ussuri-jobs
-      - check-requirements
+      - openstack-lower-constraints-jobs
       - publish-openstack-docs-pti
     check:
       jobs:

lower-constraints.txt

@@ -38,9 +38,7 @@ jsonschema==2.6.0
 keystoneauth1==3.4.0
 linecache2==1.0.0
 logilab-common==1.4.1
-libvirt-python==1.2.5
 MarkupSafe==1.0
-mock==2.0.0
 monotonic==1.4
 msgpack==0.5.6
 munch==2.2.0
@@ -113,5 +111,5 @@ unittest2==1.1.0
 urllib3==1.22
 voluptuous==0.11.1
 warlock==1.3.0
-WebOb==1.7.4
+WebOb==1.8.0
 wrapt==1.10.11

tox.ini

@@ -15,14 +15,9 @@ passenv =
 setenv =
     VIRTUAL_ENV={envdir}
     OS_TEST_PATH = ./tests/unit
-    PYTHON=coverage run --source freezer_dr --parallel-mode
 commands =
     find . -type f -name "*.pyc" -delete
     stestr run {posargs}
-    coverage combine
-    coverage html -d cover
-    coverage xml -o cover/coverage.xml
-    coverage report -m
     rm -f .coverage
     rm -rf .testrepository