NetDB:

- Better handling of unsupported encryption in destinations
 - Implement handling of unsupported encryption in router identities
 - Banlist forever all RIs with unsupported encryption
 - New negative cache of all dests with unsupported encryption
 - New methods for destination lookup that will succeed even if
   the LS is expired or encryption is unsupported
 - Use new dest lookup so client will get the right error code
   later, rather than failing with no LS when we really got it
   but just couldn't verify it.
 - Cleanups and javadocs

OCMOSJ: Detect unsupported encryption on dest and return the correct failure code
   through I2CP to streaming to i2ptunnel

Streaming: Re-enable message status override, but treat LS lookup failure
   as a soft failure for now.

HTTP Client: Add error page for unsupported encryption

apps/i2ptunnel/java/src/net/i2p/i2ptunnel/I2PTunnelHTTPClientBase.java

@@ -601,9 +601,12 @@ public abstract class I2PTunnelHTTPClientBase extends I2PTunnelClientBase implem
             return;
         int status = ise != null ? ise.getStatus() : -1;
         String error;
-        //TODO MessageStatusMessage.STATUS_SEND_FAILURE_UNSUPPORTED_ENCRYPTION
         if (status == MessageStatusMessage.STATUS_SEND_FAILURE_NO_LEASESET) {
+            // We won't get this one unless it is treated as a hard failure
+            // in streaming. See PacketQueue.java
             error = usingWWWProxy ? "nolsp" : "nols";
+        } else if (status == MessageStatusMessage.STATUS_SEND_FAILURE_UNSUPPORTED_ENCRYPTION) {
+            error = usingWWWProxy ? "encp" : "enc";
         } else {
             error = usingWWWProxy ? "dnfp" : "dnf";
         }