[SSSD] [sssd PR#1007][opened] LDAP: Remove unused sdap_refresh code

[elkoniu]

URL: https://github.com/SSSD/sssd/pull/1007
Author: elkoniu
 Title: #1007: LDAP: Remove unused sdap_refresh code
Action: opened

PR body:
"""
There was a refactoring of LDAP background refresh task
in the middle of 2019 made by Jan Hrozek and Summit Bose.
Now LDAP refresh is done by generic be_refresh.
SDAP refresh functions are unused anymore.
"""

To pull the PR as Git branch:
git remote add ghsssd https://github.com/SSSD/sssd
git fetch ghsssd pull/1007/head:pr1007
git checkout pr1007