Healthchecks support

[llaumgui]

Support for Healthchecks SaaS / On prems service.

Implementation example:

# Using Python 3 standard library:
import socket
import urllib.request

try:
    urllib.request.urlopen("https://{domain}/ping/{uuid}", timeout=10)
except socket.error as e:
    # Log ping failure here...
    print("Ping failed: %s" % e)

• Use API for start/ fail / success.
• Allow disable time calculation (start).
• Add documentation