public byte[] getPublicKey(MemberIdentifier member) {
    return publicKeys.get(new GMSMemberWrapper(member));
  }
Called initially and after each auto-reconnect. See restart handlers in InternalLocator
up in geode-core. Services must be started before this call.
geode-membership/src/main/java/org/apache/geode/distributed/internal/membership/gms/locator/GMSLocator.java