Fix bugs found via coverity (thanks to Bhaskar Jain)

 * lasso/id-wsf-2.0/data_service.c: fix uninitialized res variable in
   lasso_idwsf2_data_service_process_query_response_soap_fault_msg.
 * lasso/xml/saml-2.0/saml2_assertion.c: fix uninitialized rc variable
   in get_xmlNode.
 * lasso/saml-2.0/login.c:
   in lasso_saml20_login_accept_sso check for ni and ni->Format
   null-ness before dereferencing, remove idp_ni which is not used
   anymore.
   remote all use of federation->remote_nameIdentifier, SAML 2.0 only
   need one NameID, and it will be local_nameIdentifier.
 * lasso/xml/xml.c:
   in lasso_node_traversal, check null-ness of node before dereferencing
   it, add check for class null-ness also.
 * lasso/id-ff/provider.c:
   in lasso_provider_get_first_http_method, remove useless check for t2
   null-ness -- if found is TRUE, t1 and t2 cannot be null.
 * lasso/xml/tools.c:
   in lasso_sign_node, add documentation, check for private_key_file and
   xmlnode null-ness.
   in lasso_get_public_key_from_private_key_file, add a cleanup phase,
   check for cert variabl null-ness befor appending, count the number of
   certificates added.
   in lasso_query_verify_signature, check that URL unescaping and base64
   decoding are succesfull before using the decoded strings.
 * lasso/saml-2.0/name_id_management.c:
   in lasso_name_id_management_validate_request, fix mis-handling of
   federation, if federation does not match request name_id, return
   UNKNOWN_PRINCIPAL.

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