Updated: Add Docker service (create, remote, scale) tasks

[Flask]

This is an updated version of PR #554

Also adds the option to add/remove labels on nodes.

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@82ce87b). Click here to learn what that means.
The diff coverage is 8.33%.

@@            Coverage Diff            @@
##             master     #582   +/-   ##
=========================================
  Coverage          ?   28.02%           
=========================================
  Files             ?       19           
  Lines             ?      685           
  Branches          ?        0           
=========================================
  Hits              ?      192           
  Misses            ?      493           
  Partials          ?        0

Impacted Files	Coverage Δ
...pet/parser/functions/docker_plugin_enable_flags.rb	0% <0%> (ø)
...ib/puppet/parser/functions/docker_service_flags.rb	0% <0%> (ø)
lib/puppet/provider/docker_network/ruby.rb	50% <25%> (ø)

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