[authsaml2] in singleSignOnArtifact add support GET and POST HTTP verbs
[authsaml2] in singleSignOnArtifact add support GET and POST HTTP verbs

pu239ppy/authentic2,adieu/authentic2,BryceLohr/authentic,adieu/authentic2,BryceLohr/authentic,incuna/authentic,pu239ppy/authentic2,BryceLohr/authentic,pu239ppy/authentic2,incuna/authentic,incuna/authentic,pu239ppy/authentic2,incuna/authentic,adieu/authentic2,adieu/authentic2,BryceLohr/authentic,incuna/authentic