Improved handling of getting its own hostname and port and so on... this may...

Improved handling of getting its own hostname and port and so on... this may cause that people that have included https://foo:443 may now have to remove :443 from their metadata

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@54 44740490-163a-0410-bde0-09ae8108e29a