This is needed by OTP. Since SSSD has a 'try' option for FAST configuration, setting this by default doesn't fail if FAST can't be used.
https://www.redhat.com/archives/freeipa-devel/2014-February/msg00100.html
Duplicate: #4170
FAST cache is instead enabled by default in SSSD - no change in FreeIPA is needed then:
https://fedorahosted.org/sssd/ticket/2237
Metadata Update from @npmccallum: - Issue assigned to someone - Issue set to the milestone: 0.0 NEEDS_TRIAGE
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