[krbdev.mit.edu #3697] kadmin hangs indefinitely when admin princ has escaped chars

[Public Submitter via RT]

kadmin hangs indefinitely when an admin principal contains escaped '@'s
or '\'s.

bash-3.00# /usr/local/bin/kinit 'pop\@home/admin'
Password for pop\@home/admin at ACME.COM:
bash-3.00# /usr/local/sbin/kadmin
<hangs indefinitely here>

I've attached a suggested fix.