fix: datasource pass unicode to foreach_execute in py26

[xiangce]

• when collecting in py26 env, if the foreach_execute specs depends
  on datasource, the provider will be in unicode type and cause validate()
  failed
• this change converted the unicode to string by force for all 'cmd' passed to
  CommandOutputProvider

Signed-off-by: Xiangce Liu [email protected]

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Complete Description of Additions/Changes:

• In the integration test under py26, the foreach_execute depends on
  datasources cannot be collected as expected due to the following error:

  File "/root/insights-core/insights.zip/insights/core/spec_factory.py", line 365, in validate
    if not which(cmd, env=self._env):
  File "/root/insights-core/insights.zip/insights/util/__init__.py", line 60, in which
    if os.access(cmd, os.X_OK) and os.path.isfile(cmd):
TypeError: access() argument 1 must be encoded string without NULL bytes, not str

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.69%. Comparing base (ccb65c1) to head (04b7bcf).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4232   +/-   ##
=======================================
  Coverage   76.69%   76.69%           
=======================================
  Files         759      759           
  Lines       41788    41788           
  Branches     9603     9603           
=======================================
  Hits        32051    32051           
  Misses       8638     8638           
  Partials     1099     1099           

Flag	Coverage Δ
unittests	76.67% <100.00%> (ø)

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