* feat(server): improved server shutdown and integration tests
Added `--shutdown-grace-period` flag to `kopia server start` command
which can be used to specify how long the server will wait for active
connections to finish before forcibly shutting down.
This allowed removal of final out-of-process execution of
during integration tests and the need for `integration-tests` target
which was running the same tests as `tests` but in out-of-process mode.
We thus now have all the test coverage in-process without having to
build and launch `kopia` binary.
* fixed logging
* increase test timeout
* speed up and/or parallelize longest-running tests
e6612977b7