[SSSD] [sssd PR#528][synchronized] NSS: Adjust netgroup setnetgrent cache lifetime if midpoint refresh is used

[jhrozek]

   URL: https://github.com/SSSD/sssd/pull/528
Author: jhrozek
 Title: #528: NSS: Adjust netgroup setnetgrent cache lifetime if midpoint refresh is used
Action: synchronized

To pull the PR as Git branch:
git remote add ghsssd https://github.com/SSSD/sssd
git fetch ghsssd pull/528/head:pr528
git checkout pr528