saml: Add support for SAML 1.1 IdP init SSO.
saml: Add support for SAML 1.1 IdP init SSO.

Some limitations apply. Specifically, no support for the Artifact
binding, and the TARGET parameter must be an absolute url.

git-svn-id: a243b28a2a52d65555a829a95c8c333076d39ae1@2568 44740490-163a-0410-bde0-09ae8108e29a

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