Revert "Fix configuring httpd with custom user/group."

This reverts commit 08f9da2e8eb9d3da39a1f28e191bd4fb7fd2fa45.
Fix configuring apache with extra user/group

This fix is consistent with all the other modules.
Fix trying to add users to non-existent groups
Merge pull request #2894 from kirelagin/fixusergroup

Fix conditional handling of users and groups in some services