[SSSD] [sssd PR#588][opened] nss-imap: add sss_nss_getsidbyuid() and sss_nss_getsidbygid()

[sumit-bose]

   URL: https://github.com/SSSD/sssd/pull/588
Author: sumit-bose
 Title: #588: nss-imap: add sss_nss_getsidbyuid() and sss_nss_getsidbygid()
Action: opened

PR body:
"""
Two new calls are added to allow the caller to specify if the given POSIX
ID is a UID or a GID and the expected result is a user or a group
respectively. This is needed because on POSIX a user and a group may share
numerically the same ID value but might have different SIDs assigned.

Related to https://pagure.io/SSSD/sssd/issue/3629
"""

To pull the PR as Git branch:
git remote add ghsssd https://github.com/SSSD/sssd
git fetch ghsssd pull/588/head:pr588
git checkout pr588