Squad

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.

This 1.54 release bring a handful of bugfixes and improvements:

* Bug fixes
* handle LAVA HTTP/500 responses from the api
* fix several bug in the metric page and improve overall performance
* fix a race-condition bug when processing multiple result submissions

* New features
* allow filtering builds by id and testjobs by backends

Complete list of changes going in:

* api: rest: add allow filtering testjobs by backend
* api: rest: allow filtering builds by id
* ci: lava: catch submission errors on 500 errors
* ci: tuxsuite: handle failed jobs
* core: BuildSummary: add uniqueness constraint
* core: queries: improve overall query performance
* core: queries: remove extra order_by
* frontend: chart.js: avoid drawing charts on empty environments
* frontend: queries: improve query performance
* frontend: templatetags: avoid having 'None' rendered
* frontend: views: avoid None in threshold metric data