metaedit: Fix cross-site scripting.
metaedit: Fix cross-site scripting.

metaedit fails to validate the userid. If a malicious user is able to
make another user log in as that user id, he will be able to run scripts
in the domain of the site.

rchavik/simplesamlphp,rchavik/simplesamlphp,rchavik/simplesamlphp,rchavik/simplesamlphp