Fixes#6127.
* Added lineage name validity check
* Verify lineage name validity before obtaining certificate
* Added linage name limitation to cli help
* Update documentation on certificate name
* Added lineage name validation to changelog
* Use filepath seperators to determine lineagename validity
* Add unittest for private choose_lineagename method
Co-authored-by: Brad Warren <bmw@users.noreply.github.com>
