pull up r19069 from trunk

pull up r19069 from trunk

 r19069@cathode-dark-space:  jaltman | 2007-01-18 07:43:58 -0500
 ticket: new
 subject: NIM Kerberos 5 Provider corrections
 tags: pullup
 component: windows

 	When validating a Kerberos 5 principal name, the request
 	to the KDC should not request forwardable, renewable, or
 	proxiable options as these may be blocked by policy and
 	will result in the return of an error.

 	Always treat the Kerberos 5 principal name as valid
 	unless the KDC returns an error that clearly indicates that
 	the principal name does not exist.

 	Use a MEMORY: ccache for temporary storage instead of an
 	API: ccache.

 	Initialize pointer values with NULL instead of 0.

ticket: 5400
version_fixed: 1.6.1

git-svn-id: svn://anonsvn.mit.edu/krb5/branches/krb5-1-6@19318 dc483132-0cff-0310-8789-dd5450dbe970