Ameliorate support for lasso_profile_set_signature_verify_hint

 * lasso/id-ff/profile.h:
   - add end symbol for enum LassoProfileSignatureVerifyHint
 * lasso/id-ff/profile.c:
   - fix documentation of lasso_profile_set_signature_verify_hint
   - do not allow to set or return invalid value for the
     signature_verify_hint attribute.
 * lasso/saml-2.0/login.c:
   - handle new enum value
 * lasso/saml-2.0/profile.c:
   - handle new enum value
   - fix missing catch of signature error reporting when
     signature_verify_hint is IGNORE.
 * docs/reference/lasso/lasso-sections.txt:
   - export enums LassoProfileSignatureHint and
     LassoProfileSignatureVerifyHint
 * tests/metadata_tests.c:
   - fix test of all Role enumerations

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