Fix gss_pseudo_random leak on zero length output

Nobody is likely to ever ask for zero bytes of output from
gss_pseudo_random, but if they do, just return an empty buffer without
allocating.  Otherwise we leak memory because gss_release_buffer
doesn't do anything to buffers with length 0.

ticket: 7838 (new)
Add test coverage for gss_pseudo_random

Add a test program which compares gss_pseudo_random outputs against
expected values for each enctype.
Remove krb5-send-pr

Remove the GNATS-based krb5-send-pr script and replace it with a
script that instructs users to send email.

ticket: 7840 (new)
Reinitialize ulog when wrapping serial number

When we wrap the serial number, reinitialize the ulog so that kdb_num
starts counting from 1, instead of leaving the ulog in a weird state
where kdb_num == ulogentries but kdb_last_sno == 1 and the serial
numbers in the circular array aren't necessarily contiguous.

ticket: 7839 (new)
target_version: 1.12.2
tags: pullup
Add test case for ulog serial number wrapping

Add a unit test program named t_ulog.  Make it map a ulog file, set up
header state where kdb_last_sno is the last serial number, and then
add an empty update.  Check that the result is a ulog header with one
update at serial number 1.

ticket: 7839
Check for unstable ulog in ulog_get_entries

If a process terminates in the middle of a logged database update, it
will release its lock and leave the ulog in the KDB_UNSTABLE state.
kadmind should notice this when it calls ulog_get_entries, but right
now it only checks for the KDB_CORRUPT state (which is never set any
more) and does not recover.  Check for any state other than KDB_STABLE
and recover by resetting the ulog and forcing full resyncs to slaves.

ticket: 7853 (new)
target_version: 1.12.2
tags: pullup
Remove kdb5_util load iprop safety net

Revert the safety net added #7370.  As written it only applied to the
master KDC, where a normal load sometimes makes sense.  Even on a
slave, there are edge cases where it can make sense to do a normal
load.

ticket: 7850 (new)
Fix kpropd -x

A missing break in the switch statement caused kpropd -x to error out
with a usage message.

ticket: 7854 (new)
target_version: 1.12.2
tags: pullup