* add strategy mitogen_linear when installed mitogen
* add small docs
Rename playbook file
The raw action executes as a regular Mitogen connection, which requires Python on the target, so add strategy: linear to bootstrap-os role playbook.
* add mitogen to CI test
fix typo
* enable mitogen test on deploy-part1 tests
change version from master to release
download tar.gz archive
* run all CI tests with mitogen
* disable mitogen with upgrade CI tests
* enable mitogen on CI tests via env vars
* disable mitogen on CI test by default, enable on some different OS
* disable mitogen CI test on centos8
(get error /usr/bin/python: No such file or directory)
