[SSSD] [sssd PR#5784][comment] proxy: allow removing group members

[pbrezina]

URL: https://github.com/SSSD/sssd/pull/5784
Title: #5784: proxy: allow removing group members

pbrezina commented:
"""
I did not test it, but codewise ack.
"""

See the full comment at https://github.com/SSSD/sssd/pull/5784#issuecomment-954680724