[SSSD] [sssd PR#164][comment] Remove unused import of run_shell from tests

[fidencio]

URL: https://github.com/SSSD/sssd/pull/164
Title: #164: Remove unused import of run_shell from tests

fidencio commented:
"""
Obvious ACK. Interesting that it's been there since forever.
"""

See the full comment at https://github.com/SSSD/sssd/pull/164#issuecomment-281760586