Squad

This 1.57 release adds a few new changes with regards to api. Now job submissions
with malformed definitions will be rejected. Also results submissions with bad
datetime format will be rejected. Lastly, there's a new feature within the build
page that when appending "/api" to its url, will redirect the request to the
build api view.

Complete list of changes going in:

* api: add_test_run: signal invalid request on validation errors
* api: ci: reject job submission with malformed definition
* dev-docker: install pytest-django
* dev-docker: take a custom port number via $PORT
* frontend: build: add redirect URL to get API URL

This 1.56 release marks a very important change to SQUAD: it changes its
license to GPLv3+.

The release also adds a new feature in builds allowing users to mark releases.
This will be useful when comparing builds against releases, instead of comparing
them against latest builds. Thanks Milosz!

Complete list of changes going in:

* Change license to GPLv3+
* api: add build filtering by is_release field
* core:
* Add is_release and release_label to Build object
* fix syntax issue
* plugins: fix code style around `yield`
* frontend:
* add UI for setting Build.is_release
* fix reverse url for annotations UI
* Add release indication in the build list
* Drop French translations
* Drop Norwegian translation

This 1.55 release fixes a bug when fetching tuxsuite tests when
build had failed.

The release also contains a newer version os squad-plugins/tradefed,
which fixes a bug parsing xml iteratively and parse ASSUMPTION_FAILURE
tests as expected failure.

This 1.54.3 release improves performance of operations
using TestComparison and MetricComparison with regressions
and fixes only, by removing duplicated rows from the result
query.

It also fixes the use case that retries fetching TuxSuite jobs.

This 1.54.2 release uses a refactored implementation of
squad-linaro-plugins/tradefed, consuming much less memory
when computing CTS/VTS results

This 1.54.1 release improves performance of fetch tasks
by reducing the number of queries when computing tests stats.

The release also fixes a bug when fetching a job in TuxSuite
that has unknown status.