All `pcs` commands are crashing with python stack trace after failed upgrade of `pcs` package.

Issue

• After attempt to upgrade pcs package the pcs commands are crashing with stack trace below containing line File "/usr/lib/python2.7/site-packages/pcs/pcs.py", line 6, in <module>

  # pcs
  Traceback (most recent call last):
  File "/usr/sbin/pcs", line 9, in <module>
    load_entry_point('pcs==0.9.158', 'console_scripts', 'pcs')()
  File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 378, in load_entry_point
    return get_distribution(dist).load_entry_point(group, name)
  File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 2566, in load_entry_point
    return ep.load()
  File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 2260, in load
    entry = __import__(self.module_name, globals(),globals(), ['__name__'])
  File "/usr/lib/python2.7/site-packages/pcs/app.py", line 13, in <module>
    from pcs import (
  File "/usr/lib/python2.7/site-packages/pcs/acl.py", line 10, in <module>
    from pcs import (
  File "/usr/lib/python2.7/site-packages/pcs/prop.py", line 11, in <module>
    from pcs import (
  File "/usr/lib/python2.7/site-packages/pcs/node.py", line 11, in <module>
    from pcs import (
  File "/usr/lib/python2.7/site-packages/pcs/utils.py", line 26, in <module>
    from pcs import settings, usage
  File "/usr/lib/python2.7/site-packages/pcs/settings.py", line 1, in <module>
    from pcs.settings_default import *
  File "/usr/lib/python2.7/site-packages/pcs/pcs.py", line 6, in <module>    <---------
    import cluster
  File "/usr/lib/python2.7/site-packages/pcs/cluster.py", line 25, in <module>
    from pcs import (
  File "/usr/lib/python2.7/site-packages/pcs/constraint.py", line 13, in <module>
    from pcs import (
  File "/usr/lib/python2.7/site-packages/pcs/rule.py", line 11, in <module>
    from pcs import utils
  ImportError: cannot import name utils