[SSSD] [sssd PR#458][comment] overrides: fixes for sysdb_invalidate_overrides()

[lslebodn]

URL: https://github.com/SSSD/sssd/pull/458
Title: #458: overrides: fixes for sysdb_invalidate_overrides()

lslebodn commented:
"""
master:
* a52226c651308a0a7732544b492eb4db56b84f1d
* f29040342a6d69e170f4543662621f2e27221f91
* 919b5d76057d31877e0c25ca495711ff76c713d6
* 4671acb949c65c5c080532e03b1b6f1c9377a6a5
* 7988988aab5bd0249476671b850eb3909aa753f8
* b6d3da6cfe78c6d0ddb854088bc23e293b336401
"""

See the full comment at https://github.com/SSSD/sssd/pull/458#issuecomment-348526269