Fix AuthRequest when base URL contains query params.
Fix AuthRequest when base URL contains query params.

If the SSO target URL already contains a query part, the SAMLRequest
parameter should be separated from the URL with '&' instead of '?'.

onelogin/python-saml,elbaschid/python-saml,tachang/python-saml,mobify/python-saml,mobify/python-saml,pitbulk/python3-saml,mpaulweeks/python-saml,novafloss/python-saml,ninadpdr/python-saml,elbaschid/python-saml,pitbulk/python3-saml,onelogin/python3-saml,mpaulweeks/python-saml,novafloss/python-saml,onelogin/python3-saml,sandeep048/python-saml,jkgneu12/python3-saml,appliedx/python-saml,appliedx/python-saml,onelogin/python-saml,vivekgarhewal/med,ninadpdr/python-saml,jkgneu12/python3-saml,vivekgarhewal/med,tachang/python-saml,sandeep048/python-saml