Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>

Signed-off-by: Derek Nola <derek.nola@suse.com>

* Removed vagrant folder
* Fix comments around E2E ENVs
* Eliminate testutil folder
* Convert flock integration test to unit test
* Point to other READMEs
Signed-off-by: Derek Nola <derek.nola@suse.com>

* Fixed control group vagrantfile so running vagrant up doesn't fail locally
Signed-off-by: Derek Nola <derek.nola@suse.com>

- updated `tests/TESTING.md`
- cgroup, snapshotter, and install tests all under tests/vagrant
- cgroup and snapshotter workflows trigger for all code changes on all branches (excluding markdown docs, install script, and other vagrant tests)
- install workflow triggers for relevant script and fixture changes, only on master or pull-requests that target it
- integration and unit test workflows should not trigger for install script changes nor anything under tests/vagrant
Signed-off-by: Jacob Blain Christen <jacob@rancher.com>