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

[jhrozek]

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

jhrozek commented:
"""
* master: 1b55ac98db6a319d45edae6c27ff3804f1f4d28a
"""

See the full comment at https://github.com/SSSD/sssd/pull/164#issuecomment-281938239