Adds a metadata record for the specified OID.
     hcerr_t hc_store_metadata_ez(hc_session_t *session,
          hc_oid *oid,
          hc_nvr_t *nvr,
          hc_system_record_t *system_record);
This function adds a metadata record for the specified OID and returns a system_record descriptor.
session
IN: The session for the host and port to talk to.
oid
IN: An identifier of object data to which the metadata record is attached.
nvr
IN: Pointer to a name-value record with the metadata.
system_record
OUT: Returned descriptor of a stored metadata record.
     HCERR_OK
     HCERR_BAD_REQUEST
     HCERR_OOM
     HCERR_NULL_SESSION
     HCERR_INVALID_SESSION
     HCERR_INVALID_NVR
     HCERR_INVALID_OID
     HCERR_ILLEGAL_ARGUMENT
     HCERR_XML_BUFFER_OVERFLOW