SimpleSAML_Auth_Simple: Add restart URL when initializing login.
SimpleSAML_Auth_Simple: Add restart URL when initializing login.

This adds a restart URL that should handle bookmarked discovery service page.

Fixes issue 229.
tectronics/simplesamlphp,tectronics/simplesamlphp,tectronics/simplesamlphp,vivekrajenderan/simplesamlphp,tectronics/simplesamlphp,vivekrajenderan/simplesamlphp,vivekrajenderan/simplesamlphp,tectronics/simplesamlphp,vivekrajenderan/simplesamlphp,vivekrajenderan/simplesamlphp