ContainerBase testing and some small changes

[JayH5]

• Add tests for presence of inner container object
• Rename container() to inner()
• Rework waiting for log lines a bit

[codecov[bot]]

Codecov Report

Merging #13 into develop will increase coverage by 0.83%. The diff coverage is 99.06%.

@@             Coverage Diff             @@
##           develop      #13      +/-   ##
===========================================
+ Coverage    98.33%   99.16%   +0.83%     
===========================================
  Files           16       18       +2     
  Lines          899      958      +59     
  Branches        68       72       +4     
===========================================
+ Hits           884      950      +66     
+ Misses          11        7       -4     
+ Partials         4        1       -3

Impacted Files	Coverage Δ
seaworthy/tests-core/containers/__init__.py	100% <ø> (ø)
seaworthy/tests-core/containers/test_base.py	100% <100%> (ø)
seaworthy/tests/containers/test_provided.py	100% <100%> (ø)
seaworthy/containers/base.py	100% <100%> (ø)
seaworthy/containers/provided.py	90% <88.88%> (ø)
seaworthy/tests-testtools/__init__.py

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