Werk #7952: mk_docker.py: Add base_url to bakery rule config options

Component	Checks & agents
Title	mk_docker.py: Add base_url to bakery rule config options
Date	Jul 18, 2019
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.6.0b4 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

Users with non-default setups can now provide the base URL for docker API engine calls. By default we are trying to connect via the unix socket at unix://var/run/docker.sock.

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