pull up r19920 from trunk

pull up r19920 from trunk

 r19920@cathode-dark-space:  epeisach | 2007-09-04 22:08:58 -0400
 ticket:new
 subject: krb5_fcc_generate_new is non-functional

 File locking was non-existant in this code and fccs chained list was
 not used at all. This resulted in an assertion failure when closing the
 cache.  Code has been reorganized to parallel the code in krb5_fcc_resolve
 for easier maintenence.

 Commented out test in t_cc.c has been updated to actually test this code.

ticket: 5708
version_fixed: 1.6.3

git-svn-id: svn://anonsvn.mit.edu/krb5/branches/krb5-1-6@19932 dc483132-0cff-0310-8789-dd5450dbe970