[SSSD] [sssd PR#812][comment] Implement background refresh for IPA and AD domains and subdomains

[jhrozek]

  URL: https://github.com/SSSD/sssd/pull/812
Title: #812: Implement background refresh for IPA and AD domains and subdomains

jhrozek commented:
"""
Thank you for the review, the first two patches change the sysdb lookups to check the
timestamp cache.
"""

See the full comment at https://github.com/SSSD/sssd/pull/812#issuecomment-496511796