Task restoring works but dead tasks may be restarted

Fix driver naming, fingerprint output, races/tests

UI: build time performance improvements

UI: Reset page query param on search

Update changelog with GH-4819

Allow artifacts checksum interpolation

In tests:
* always cleanup (Kill) the harness
* don't call SetConfig more than once (a race)
* avoid cgroups to allow running without being root

Also fix a comment on the logger that got copy/pasted around.

Fix formatting of allocation score metrics

Searchable can be used without pagination, but reseting pagination
is more a function of search than pagination insofar as if you
add search to a page, you are also going to want automatic pagination
resetting.

qemu: fix build and register by default

Fixes https://github.com/hashicorp/nomad/issues/4814

API changes had broken the build.

fix: increase log rotator line scan limit

Pass client configuration to plugins through loader

AR Fixes: task leader handling, restoring, state updating, AR.Destroy deadlocks