Revert "Remove run-cover role"

This reverts commit 18d9d8df3d.

Change-Id: I462751ef5137bf161125505df821583d301845ba

roles/run-cover/defaults/main.yaml

@@ -0,0 +1,3 @@
+---
+tox_environment: cover
+zuul_work_dir: "src/{{ zuul.project.canonical_name }}"

roles/run-cover/tasks/main.yaml

@@ -0,0 +1,30 @@
+- name: Run code coverage
+  args:
+    chdir: "{{ zuul_work_dir }}"
+  shell: |
+    #!/bin/bash -xe
+
+    # Run coverage via tox. Also, run pbr freeze on the
+    # resulting environment at the end so that we have a record of exactly
+    # what packages we ended up testing.
+
+    export NOSE_COVER_HTML=1
+    export UPPER_CONSTRAINTS_FILE=$(pwd)/upper-constraints.txt
+
+    venv={{ tox_environment }}
+
+    # Workaround the combo of tox running setup.py outside of virtualenv
+    # and RHEL having an old distribute. The next line can be removed
+    # when either get fixed.
+    python setup.py --version
+
+    tox -e$venv
+    result=$?
+    [ -e .tox/$venv/bin/pbr ] && freezecmd=pbr || freezecmd=pip
+
+    echo "Begin $freezecmd freeze output from test virtualenv:"
+    echo "======================================================================"
+    .tox/${venv}/bin/${freezecmd} freeze
+    echo "======================================================================"
+
+    exit $result