[sssd PR#334][opened] Print a warning when enumeration is requested but disabled

[amitkumar50]

   URL: https://github.com/SSSD/sssd/pull/334
Author: amitkumar50
 Title: #334: Print a warning when enumeration is requested but disabled
Action: opened

PR body:
"""
Purpose of this PR is to add an explanatory message to be logged once at the start-up
explaning that if enumeration is off 'getent passwd' will not return all users
information. This is by design.
Again Log level for this message it kept low [SSSDBG_OP_FAILURE     0x0040   /* level 2
*/]. We want this message to be printed in almost all cases because it tells this
functionality is be design and prevents anyone from opening a bug.

Resolves: https://pagure.io/SSSD/sssd/issue/2301
"""

To pull the PR as Git branch:
git remote add ghsssd https://github.com/SSSD/sssd
git fetch ghsssd pull/334/head:pr334
git checkout pr334