Try a slightly more drastic DockerHelper refactor

[JayH5]

• Make DockerHelper just take a Docker client at initialization, rather than one at setup
• Share common logic in HelperBase class
• Each helper only has access to as much as it needs
• Rename helpers
• Move some more methods from DockerHelper to ContainerHelper

[codecov[bot]]

Codecov Report

Merging #28 into develop will decrease coverage by <.01%. The diff coverage is 100%.

@@             Coverage Diff             @@
##           develop      #28      +/-   ##
===========================================
- Coverage    99.58%   99.58%   -0.01%     
===========================================
  Files           22       22              
  Lines         2185     2178       -7     
  Branches       146      144       -2     
===========================================
- Hits          2176     2169       -7     
  Misses           7        7              
  Partials         2        2

Impacted Files	Coverage Δ
seaworthy/tests-core/test_logs.py	100% <ø> (ø)	:arrow_up:
seaworthy/tests-core/containers/test_base.py	100% <ø> (ø)	:arrow_up:
seaworthy/pytest/fixtures.py	94.44% <ø> (-0.16%)	:arrow_down:
seaworthy/tests/containers/test_provided.py	100% <ø> (ø)	:arrow_up:
seaworthy/tests-core/test_client.py	100% <100%> (ø)	:arrow_up:
seaworthy/tests-core/test_dockerhelper.py	100% <100%> (ø)	:arrow_up:
seaworthy/dockerhelper.py	100% <100%> (ø)	:arrow_up:
seaworthy/containers/base.py	100% <0%> (ø)	:arrow_up:

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