sosreport traceback on RHEL6, ending in "ImportError: No module named rpm"

Issue

• 'sosreport' bombs out with the below error:

        # sosreport
        Traceback (most recent call last):
          File "/usr/sbin/sosreport", line 18, in <module>
            from sos.sosreport import sosreport, doExitCode
          File "/usr/lib/python2.6/site-packages/sos/sosreport.py", line 40, in <module>
            import sos.policyredhat
          File "/usr/lib/python2.6/site-packages/sos/policyredhat.py", line 31, in <module>
            import rpm
        ImportError: No module named rpm