* resolved mypy untyped defs in parser.py
* resolved mypy untyped defs in obj.py
* removed unused imports
* resolved mypy untyped defs in http_01.py
* resolved mypy untyped defs in tls_sni_01.py
* resolved mypy untyped defs in configurator.py
* address mypy too-many-arguments error in override_centos.py
* resolved mypy untyped defs in http_01_test.py
* removed unused 'conf' argument that was causing mypy method assignment error
* address mypy error where same variable reassigned to different type
* address pylint and coverage issues
* one character space change for formatting
* fix required acme version for certbot-apache