So that we can increase it from the default 114688
Useful in case for example the OS-Federation mapping is too large.
If this limit is breached keystone will return a 413 Entity Too Large
and not log anything to keystone.log.
Closes-Bug: #1835161
Change-Id: If9fc5c0bb5d6216b8656ee1673e1812c543de305
Signed-off-by: Johan Guldmyr <johan.guldmyr@csc.fi>
(cherry picked from commit a60980f3da)