Merge pull request #1100 from DeterminateSystems/nest-tests

Dependencies

• [2] EBN3NCSU Tests: restructure to more closely mirror the sources
• [3] L3B3ZS37 JobsetEval/cancel: test & fix
• [4] LYRHVDS2 TT: add helpers for linking to jobs, jobsets, and projects, and for generating colon separated names.
• [5] VHC5UKOB rename api-test.pl to .t so it runs under yath
• [6] OPSWSU4L hydra-notify: move BuildStarted processing to an Event
• [7] ASPD4MDN Passwords: check in constant time
• [8] S2KNQCPB NixExprs: extract the `escape` function and test it
• [9] QOV7KWRH Expose Prometheus metrics at /metrics
• [10] 4Y3LBQYI Use system-features from the Nix conf in the default machine file
• [11] 5DXGOH6Q statsd: add a chance to set hostname and port in hydra.conf
• [12] OKOQ3LNQ Admin/clear-queue-non-current: test behavior
• [13] LN3E2P4E t: Test Projects JSON serialization and deserialization
• [14] LQDK2TS5 Test that each page listing evals works
• [15] 2JJP7673 tests: move to t, allow `yath test` from root
• [16] DNOLOMX7 hydra-send-stats: add a failing test asserting it can run
• [17] NNKWJGML t/JobsetEval: test GETing the eval page
• [18] P4SME2BC Abstract over postgres' LISTEN/NOTIFY
• [19] MQLCUSZL Test the fake derivations channel, asserting nested packages are properly represented.
• [20] TVXPKQL4 Move the default-machine-file test under `queue-runner`
• [21] GD5IRH26 move the api-test.nix in to the jobsdir
• [22] HWGFAF2B queue runner: test notifications
• [23] EKHD4I44 Event: init structure and parse existing messages
• [24] SWXGVPJN hydra-notify: extract runPluginsForEvent to a TaskDispatcher
• [25] L32HJNV5 Hydra::Math: add an exponential_backoff function
• [26] 3R3AYTCQ t/BuildDiff: init
• [27] 6BPELYYT Create a helper for dealing with nested attribute sets
• [28] QTZ6UUOM Hydra::Helper::Nix::getMachines: add a test
• [29] M5WS7Z65 t/Helper/CatalystUtils.t: test trim functionality
• [30] ZZ4HEML6 JobsetEval/restart-*: Write tests for the behavior
• [31] BJIR6VCG Start checking PRs with perlcritic

Change contents

• file un-deletion: Controller (d--r------)Controller (d--r------)
  [3.473]→[3.451:451](∅→∅),[3.697]→[3.452:473](∅→∅),[3.697]→[3.452:473](∅→∅)
• file un-deletion: JobsetEval (d--r------)JobsetEval (d--r------)
  [3.23]→[3.1:1](∅→∅),[3.451]→[3.2:23](∅→∅),[3.451]→[3.2:23](∅→∅)
• file un-deletion: Helper (d--r------)Helper (d--r------)
  [3.999]→[3.981:981](∅→∅),[3.697]→[3.982:999](∅→∅),[3.697]→[3.982:999](∅→∅)