Randomize the password on Heimdal principal creation

When creating new principals in a Heimdal KDC, generate a long, random
password as the temporary password of the disabled principal before
randomizing keys.  This is necessary if password quality is being
enforced on create calls.  Since the principal is always inactive
until the keys have been randomized, the password should not need to
be secure (and indeed is not cryptographically random).

Change-Id: If519a82475bb0d387a19d16ef1e024b0da64779a
Reviewed-on: https://gerrit.stanford.edu/1374
Reviewed-by: Russ Allbery <rra@stanford.edu>
Tested-by: Russ Allbery <rra@stanford.edu>

Conflicts:
	NEWS

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