Speed up execution time spec
Speed up execution time spec

Previously the spec would take ~15s to run, now down to ~3s saving
~12s per exec by primarilly asserting against single
md:EntitiesDescriptor instance only.

ausaccessfed/saml-service,ausaccessfed/saml-service,ausaccessfed/saml-service,ausaccessfed/saml-service