[Bug 1673511] [NEW] ClientException should inherit from EnvironmentError, not generic Exception

[George Shuklin]

Public bug reported:

Right now all exceptions for keystoneauth1 are inherited from
ClientException, which in turn inherited from Exception. I believe that
ClientException should inherit from  EnvironmentError, as those errors
have same origin as other  EnvironmentErrors, like IOError or OSError.

** Affects: python-keystoneauth1 (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1673511

Title:
  ClientException should inherit from EnvironmentError, not generic
  Exception

Status in python-keystoneauth1 package in Ubuntu:
  New

Bug description:
  Right now all exceptions for keystoneauth1 are inherited from
  ClientException, which in turn inherited from Exception. I believe
  that ClientException should inherit from  EnvironmentError, as those
  errors have same origin as other  EnvironmentErrors, like IOError or
  OSError.

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