Add openstack-cover-jobs for watcherclient

Change-Id: Idc5e67bc5bf61bd02147e52872a9fcf7d71eeae4

.coveragerc

@@ -0,0 +1,11 @@
+[run]
+branch = True
+source = watcherclient
+omit =
+    watcherclient/tests/*
+
+[report]
+ignore_errors = True
+exclude_lines =
+    @abc.abstract
+    raise NotImplementedError

.stestr.conf

@@ -1,3 +1,3 @@
 [DEFAULT]
-test_path=./watcherclient/tests/functional
+test_path=./watcherclient/tests/unit
 top_dir=./

.zuul.yaml

@@ -1,5 +1,6 @@
 - project:
     templates:
+      - openstack-cover-jobs
       - openstack-lower-constraints-jobs
       - openstack-python-jobs
       - openstack-python35-jobs