Update NOTICE with new changes for 1.13

The KCM RPC definitions are copyright KTH/Apple, since it is present
for interoperability with OS X.

Add MS-KKDCP client copyright; alas, it does not match the existing
Red Hat copyrights, since the new code is a 2-clause BSD license, and
there was only a 3-clause Red Hat copyright block present already.

The actual Sphinx output for NOTICE would adjust the wrapping and
indentation of some existing content, but those changes were removed
by hand, so this commit only reflects new added content.

ticket: 8006
tags: pullup
target_version: 1.13
Re-encrypt preserved key data in new master key

When we are preserving old key data in kdb_cpw.c, ensure that it is
encrypted with the same master key as the new key data.  This ensures
that the KRB5_TL_MKVNO tl-data on the principal entry applies to all
of the key data, not just some of it.

ticket: 7995
target_version: 1.13
tags: pullup
Add test case for -keepold mkey re-encryption

ticket: 7995
Simplify kdb_cpw.c

In add_key_rnd, stop looking up the krbtgt DB entry; we have not used
it since 1.1.

Use copy_key_data in add_key_rnd and add_key_pwd.

krb5_dbe_crk, krb5_dbe_ark, krb5_dbe_def_cpw, and krb5_dbe_apw all
contained similar logic.  Consolidate all of them into a static helper
function which does the work of all four.  The ark/apw variants had
slightly different behavior then crk/cpw with keepold=true, so
introduce a three-value enum to express all three behaviors.
Fix uninitialized variable bug in kdb_cpw.c

Now that add_key_rnd isn't looking up the TGT principal entry, it
could use retval before initializing it if the loop runs for zero
iterations.  Get rid of the add_key_rnd label (as it no longer does
anything) and just return 0 after the loop ends.