pull up r20536 from trunk

 r20536@cathode-dark-space:  tlyu | 2008-07-17 19:40:32 -0400
 ticket: 6018
 target_version: 1.6.4
 tags: pullup
 
 In krb5_rc_io_creat(), unlink any existing rcache file before trying
 to create a new rcache.  This allows better recovery from corrupt
 rcache files.
 
 


Commit By: tlyu



Revision: 20547
Changed Files:
_U  branches/krb5-1-6/
U   branches/krb5-1-6/src/lib/krb5/rcache/rc_io.c