NOJIRA: logging and API URL improvements

[Tsonov]

Changes:

• Prepend https:// if API_URL has no protocol. Otherwise resty fails to send requests with protocol scheme error - and that is rarely discovered as it only occurs during spot interruption, when the pod is already dying.
• Respect log level from config
• Log more things in general

Why:

• It's easy to misconfigure API URL without protocol as it's not intuitive that the library requires it (resty)
• Users don't see logs and think nothing is happening (or even worse, they see a few failed attempts that are logged and assume the handler is broken)
• Termination and stopping also logs nothing, giving no info to user
• The log level was not respected and was always Info for non-resty operations