* src/auth.c: don't bother prompting for a password and making a
    	second attempt at getting creds when a first attempt yielded a
    	user-unknown error (#400611)
    * src/password.c: force an attempt to get password-changing creds
    	even in the pathological case where we're called with "use_first_pass"
    	and there is no such password to use (#400611)
    * README: note new SCM location
    * pam_krb5.spec: bump version to 2.2.19