Fix compatibility with pre-1.11 iprop dump files

Fix compatibility with pre-1.11 iprop dump files

Ticket #7223 added new policy fields and a new dump format version to
marshal them, but did not add a new iprop dump format version.  As a
result, slave KDCs running 1.11 or later cannot receive full resyncs
from master KDCs running 1.10 or earlier.  (Reported by John
Devitofranceschi.)

Retroactively add support for pre-1.11 policy entries by making
process_r1_11_policy() read the first ten fields, check whether the
next whitespace character is a newline, and then read the rest if it
is not.

(back ported from commit 3c9ab5220bcc3f57641f6f4b6942b17aadb6613d)
(cherry picked from commit 6f1b25097969b4685263639a5214d440ce233793)

ticket: 8317 (new)
version_fixed: 1.12.5
status: resolved