Update tox and fix broken url

Remove python2 tests
Point .gitreview at the correct repo
Add .zuul.yaml
Remove .coveragerc

Change-Id: Id58e501ae9270fe4f3c593a6d01a9d3654c9b598

.coveragerc

@@ -1,6 +0,0 @@
-[report]
-# Regexes for lines to exclude from consideration
-exclude_lines =
-    if __name__ == .__main__.:
-include=
-    hooks/cinder_*

.gitignore

@@ -1,4 +1,5 @@
 bin
+cover
 .coverage
 .testrepository
 .tox

.gitreview

@@ -1,4 +1,4 @@
 [gerrit]
 host=review.openstack.org
 port=29418
-project=openstack/charm-cinder-backup.git
+project=openstack/charm-cinder-backup-swift-proxy.git

.zuul.yaml

@@ -0,0 +1,5 @@
+- project:
+    templates:
+      - python35-charm-jobs
+      - openstack-python3-ussuri-jobs
+      - openstack-cover-jobs

tox.ini

@@ -1,66 +1,92 @@
 # Source charm: ./tox.ini
 # This file is managed centrally by release-tools and should not be modified
-# within individual charm repos.
+# within individual charm repos.  See the 'global' dir contents for available
+# choices of tox.ini for OpenStack Charms:
+#     https://github.com/openstack-charmers/release-tools
+
 [tox]
 skipsdist = True
-envlist = pep8,py35,py36
-skip_missing_interpreters = True
+envlist = pep8,py3
+# NOTE: Avoid build/test env pollution by not enabling sitepackages.
+sitepackages = False
+# NOTE: Avoid false positives by not skipping missing interpreters.
+skip_missing_interpreters = False
 
 [testenv]
 setenv = VIRTUAL_ENV={envdir}
          PYTHONHASHSEED=0
          TERM=linux
-         CHARM_LAYERS_DIR={toxinidir}/layers
-         CHARM_INTERFACES_DIR={toxinidir}/interfaces
+         LAYER_PATH={toxinidir}/layers
+         INTERFACE_PATH={toxinidir}/interfaces
          JUJU_REPOSITORY={toxinidir}/build
-passenv = http_proxy https_proxy
+passenv = http_proxy https_proxy INTERFACE_PATH LAYER_PATH JUJU_REPOSITORY
 install_command =
   pip install {opts} {packages}
 deps =
     -r{toxinidir}/requirements.txt
 
 [testenv:build]
-basepython = python2.7
+basepython = python3
 commands =
-    charm build --log-level DEBUG -o {toxinidir}/build src {posargs}
-
-[testenv:py27]
-basepython = python2.7
-# Reactive source charms are Python3-only, but a py27 unit test target
-# is required by OpenStack Governance.  Remove this shim as soon as
-# permitted.  http://governance.openstack.org/reference/cti/python_cti.html
-whitelist_externals = true
-commands = true
+    charm-build --log-level DEBUG -o {toxinidir}/build src {posargs}
 
 [testenv:py3]
 basepython = python3
 deps = -r{toxinidir}/test-requirements.txt
-commands = stestr run {posargs}
-
-[testenv:py34]
-basepython = python3.4
-deps = -r{toxinidir}/test-requirements.txt
-commands = stestr run {posargs}
+commands = stestr run --slowest {posargs}
 
 [testenv:py35]
 basepython = python3.5
 deps = -r{toxinidir}/test-requirements.txt
-commands = stestr run {posargs}
+commands = stestr run --slowest {posargs}
 
 [testenv:py36]
 basepython = python3.6
 deps = -r{toxinidir}/test-requirements.txt
-commands = stestr run {posargs}
+commands = stestr run --slowest {posargs}
+
+[testenv:py37]
+basepython = python3.7
+deps = -r{toxinidir}/test-requirements.txt
+commands = stestr run --slowest {posargs}
 
 [testenv:pep8]
 basepython = python3
 deps = -r{toxinidir}/test-requirements.txt
 commands = flake8 {posargs} src unit_tests
 
+[testenv:cover]
+# Technique based heavily upon
+# https://github.com/openstack/nova/blob/master/tox.ini
+basepython = python3
+deps = -r{toxinidir}/requirements.txt
+       -r{toxinidir}/test-requirements.txt
+setenv =
+    {[testenv]setenv}
+    PYTHON=coverage run
+commands =
+    coverage erase
+    stestr run --slowest {posargs}
+    coverage combine
+    coverage html -d cover
+    coverage xml -o cover/coverage.xml
+    coverage report
+
+[coverage:run]
+branch = True
+concurrency = multiprocessing
+parallel = True
+source =
+    .
+omit =
+    .tox/*
+    */charmhelpers/*
+    unit_tests/*
+
 [testenv:venv]
 basepython = python3
 commands = {posargs}
 
 [flake8]
 # E402 ignore necessary for path append before sys module import in actions
-ignore = E402
+ignore = E402,W504