Merge users/lhoward/signedpath-naming-exts to trunk.  Adds an authdata
provider which makes non-PAC S4U2Proxy signedpath authdata visible to
application servers via GSS naming extensions.


https://github.com/krb5/krb5/commit/d2a071db7a60c5fe8ee48f83154a86b50fa38e0a
Commit By: ghudson
Revision: 24094
Changed Files:
U   trunk/src/lib/krb5/krb/Makefile.in
U   trunk/src/lib/krb5/krb/authdata.c
U   trunk/src/lib/krb5/krb/authdata.h
U   trunk/src/lib/krb5/krb/pac.c
A   trunk/src/lib/krb5/krb/s4u_authdata.c