Rework cleanup handling

 * lasso/utils.h:
   change 'goto exit' for 'goto cleanup'. rename all goto_exit macros to
   goto_cleanup_.  rename goto_cleanup_if_fail to
   goto_cleanup_if_fail_with_rc and add a
   goto_cleanup_if_fail for function which do not return an integer
   value. add documentation for goto_cleanup macro family.
 * lasso/id-ff/login.c:
 * lasso/id-ff/provider.c:
 * lasso/id-ff/server.c:
 * lasso/id-ff/session.c:
 * lasso/id-wsf/discovery.c:
 * lasso/id-wsf/wsf_profile.c:
 * lasso/saml-2.0/profile.c:
 * lasso/utils.h:
 * lasso/xml/lib_logout_request.c:
 * lasso/xml/tools.c:
 * lasso/xml/xml.c:
   update name of goto_exit_if_fail macros. rename 'exit' labels to
   'cleanup'.

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