Authentication

[thomastoye]

KairosDB supports authentication, but this library doesn't have support for that. Seems to be HTTP basic only, so this should be easy to implement.

See:

• http://smittnelly.blogspot.be/2015/02/enabling-auth-on-kairosdb-and-applying.html
• https://kairosdb.github.io/docs/build/html/Configuration.html (see kairosdb.jetty.basic_auth.user and kairosdb.jetty.basic_auth.password)

[thomastoye]

Implemented in (redacted commit hash)

No tests yet, will require a new Docker image with auth enabled.