[SSSD] [sssd PR#930][opened] SBUS: remove dbus fd from tevent loop when watch is removed

[alexey-tikhonov]

   URL: https://github.com/SSSD/sssd/pull/930
Author: alexey-tikhonov
 Title: #930: SBUS: remove dbus fd from tevent loop when watch is removed
Action: opened

PR body:
"""
According to the tevent API:
"To cancel the monitoring of a file descriptor, call talloc_free()
on the object returned by this (tevent_add_fd()) function."

Resolves: https://pagure.io/SSSD/sssd/issue/2660
"""

To pull the PR as Git branch:
git remote add ghsssd https://github.com/SSSD/sssd
git fetch ghsssd pull/930/head:pr930
git checkout pr930