whois domain lookup sensor (#10000)

* Init commit of new whois sensor

* Updated requirements

* Resolved updated showing expired, added expired attr

* Added missing attribute in init, added whois to coveragerc

* Various PR comment changes

- Now more resiliant to invalid hostnames
- Removed various assumed STATE_UNKOWN setting
- Upfront check for valid hostname preventing the sensor starting with dud
- Resolved unit of measurement Day, Days, None issue
- Datetime formatting now done to iso 8601 standard
- Removed all expired usage, not really that useful
- Unused hass assignment

* More PR comment resolutions

- Resolved the dilemma with hosts / single host per sensor. Now running
single domain per sensor.
- Renamed host(s) to domain

* Moved coveragerc sensor location

* Re-phrased the expiration_date warning

* Resolved assumed updated_date existence

* Resolved missing indent

* Resolved discover_info typo

* Update whois.py

script/gen_requirements_all.py

@@ -78,6 +78,7 @@ TEST_REQUIREMENTS = (
     'uvcclient',
     'warrant',
     'yahoo-finance',
+    'pythonwhois'
 )
 
 IGNORE_PACKAGES = (