Update Shibboleth-sp and its tool chain to 2.5.1.
Note that from 2.5, shibd is run as the user shibd. The port tries to fix the
key file ownership but if you have changed the file name of the key from the
default sp-key.pem, make sure you chown your key file(s) to user shibd.
Also, take maintainership of the entire tool chain (approved by all previous
Incorporates the ideas suggested by Craig Leres , making sure that the
ssl key is not added to the package.
PR: 177668, 178694