Squad

This 1.41 release adds '/api/builds/<id>/cancel/' endpoint so that
users can cancel all running test jobs of a build.

The release also implements the same denormalization pattern used
in the test model last year. It's important that if you are running
a older squad instance that after this release you run the following
command:

`./manage populate_metric_build_and_environment`

This will ensure that all new metrics will have the correct data migrated.

Complete list of changes going in:

* core: metric: add Build and Environment reference to Metric
* api: rest: add cancel endpoint to builds

This 1.40 release updates squad-plugins so that the subtasks in
the tradefed plugin won't clog up non-ci_fetch queues.

This 1.39.1 release fixes a bug that allowed unauthenticated users
to see groups with none or private-only projects.

Complete list of changes going in:

* README: update copyright year and add test badge
* scripts: test-ci: don't crash if not able to submit to qa-reports
* frontend: group_home: raise 404 on private groups
* test: mock: use stdlib's mock on python > 3.3
* travis: move to github actions

This 1.39 release makes known issues test names be parsed as
regular expressions so that users can specify known issues
as "ltp-*/flawed-test*name", instead of specifying each
as a separate known issue.

Complete list of changes going in:

* core: tasks: add support for patterns in known issue test_name

This 1.38 release fixes two major bugs in SQUAD when communicating
with LAVA backends:

1. When a testjob fails to fetch, and LAVA lab is out,
SQUAD should handle the outage an give up trying to
fetch such jobs.
2. When LAVA jobs fail due to "metadata is too large",
the results api won't return a valid metadata field,
thus causing SQUAD to break on that too

Also this release includes a health-check endpoint that
shows the availability of most of SQUAD's services.

Complete list of changes going in:

* Dockerfile: add suport to django-health-check
* Dockerfile: fix django-storage error on closing s3 file
* ci: backend: lava: handle null error_msg
* ci: backend: lava: raise TemporaryFetchIssue on fetch timeout
* frontend: build-nav: add test summary to build header
* frontend: project_settings: gather local options
* health_check: allow health-check endpoint to staff user only
* setup.cfg: ignore "C101 Coding magic comment not found" flake8 errors
* travis: disable testing on real LAVA

This 1.37.1 release is a bug fix release. It fixes a bug that shows
the "Callbacks" tab in builds with no callbacks and also fixes
a bug in the listener process that wasn't restarting dead processes.

Complete list of changes going in:

* frontend: build-nav: fix callbacks count check
* ci: listen: restart dead processes