Temporary turn off rally-tox-cover job

+ remove unsued jobs
+ remove mock from test-requirements
+ move rally-docker-build-and-push from gate queue to post

Change-Id: I2d2b50dff1a8739bca8714666acc2efc7369e4d8

.zuul.d/python-jobs.yaml

@@ -98,23 +98,3 @@
       Uses tox with the ``py27`` environment.
     vars:
       tox_env: py27
-
-- job:
-    name: rally-tox-py34
-    parent: rally-tox-base
-    description: |
-      Run unit test for rally project.
-
-      Uses tox with the ``py34`` environment.
-    vars:
-      tox_env: py34
-
-- job:
-    name: rally-tox-py35
-    parent: rally-tox-base
-    description: |
-      Run unit test for rally project.
-
-      Uses tox with the ``py35`` environment.
-    vars:
-      tox_env: py35

.zuul.d/zuul.yaml

@@ -87,7 +87,6 @@
         - rally-tox-py36
         - rally-tox-py37
         - rally-tox-py38
-        - rally-tox-cover
         - rally-tox-functional
         - rally-tox-functional-py38
         - rally-tox-self
@@ -105,13 +104,14 @@
         - rally-tox-py36
         - rally-tox-py37
         - rally-tox-py38
-        - rally-tox-cover
         - rally-tox-functional
         - rally-tox-self
         - rally-database-migration
         - rally-install-ubuntu-bionic
         - rally-install-centos-7
         - rally-install-centos-8
+    post:
+      jobs:
         - rally-docker-build-and-push:
             vars:
               docker_image_version: latest

test-requirements.txt

@@ -23,4 +23,3 @@ testresources                                          # UNKNOWN
 
 # needed for functional job
 stestr                                                 # Apache Software License
-mock