Added check-tale script

[craig-willis]

Implements check_mk part of whole-tale/terraform_deployment#7

Added check-tale local check to launch and delete a tale.

Run via CLI locally, the -d flag bypasses the Swarm master check:
python scripts/check-tale -s https://girder.prod.wholetale.org -k <girder api key> -t <tale ID> -d True
The script will ultimately be run via the check_mk container, so environment variables are required.

Note that the check_mk/local/3600 path in the entrypoint is part of the "cached local check" model described in https://mathias-kettner.de/checkmk_localchecks.html. In short, the tale check will only run every hour.

I've also configured on staging and am running an updated image wholetale/check_mk:ligo-test. Status can be seen via OMD.

[craig-willis]

Depends on whole-tale/girder_wholetale#100