Title: #255: Use default configuration with missing sssd.conf
We already enabled starting sssd with missing sssd.conf in 1.14.0. The problem was not
with missing sssd.conf but there were other reasons why it was reverted in rhel.
Unnecessary, "domain/shadowutils" in sssd.conf and AVC denials when copying to
Current approach is different and will not cause such problems.
See the full comment at https://github.com/SSSD/sssd/pull/255#issuecomment-299443473