The SLPGetRefreshInterval() function returns the
maximum across all DAs of the min-refresh-interval attribute. This value satisfies the advertised refresh interval
bounds for all DAs. If this value is used by the SA, it assures that no refresh registration will be rejected.
If no DA advertises a min-refresh-interval attribute, a value of 0 is returned.
If an error occurs, an SLP error code is returned.