Enable openstack-cover-jobs in zuul check for cyborg

In this U version, Improve UT for important Cyborg module is
an important task.

It is necessary to add openstack-cover-jobs to zuul. This way
we can easily view the unit test coverage of each file.

such as nova:
https://github.com/openstack/nova/blob/master/.zuul.yaml#L374

Change-Id: I854a51a2105628c5e5e9c30282e0f4b259c33ed3

.gitignore

@@ -31,6 +31,8 @@ doc/build/*
 doc/source/api/*
 api-ref/build/*
 
+cover
+
 AUTHORS
 Authors
 ChangeLog

.zuul.yaml

@@ -1,6 +1,7 @@
 - project:
     templates:
       - openstack-python-jobs
+      - openstack-cover-jobs
       - check-requirements
       - release-notes-jobs-python3
       - openstack-python3-train-jobs

tox.ini

@@ -66,12 +66,13 @@ commands = {posargs}
 [testenv:cover]
 basepython = python3
 setenv =
-    PYTHON=coverage run --source $project --parallel-mode
+    PYTHON=coverage run --source cyborg --parallel-mode
 commands =
     stestr run {posargs}
     coverage combine
     coverage html -d cover
     coverage xml -o cover/coverage.xml
+    coverage report
 
 [doc8]
 ignore-path = .venv,.git,.tox,*cyborg/locale*,*lib/python*,*cyborg.egg*,api-ref/build,doc/build,doc/source/contributor/api