Fix handling of multiple Kafka hosts.

When multiple Kafka hosts are specified as part of the alarm URI, the
URI cannot be parsed as a server-based URI, only as a registry-based
URI. This means that the getHosts(), getPort(), and getUserInfo()
methods return null. Therefore, we have to use getAuthority() instead
when cloning the URI.

This closes #3071.

Author: smarsching

app/alarm/ui/src/main/java/org/phoebus/applications/alarm/ui/tree/AlarmTreeInstance.java

@@ -49,7 +49,9 @@ public AlarmTreeInstance(final AlarmTreeApplication app, final URI input) throws
         this.app = app;
 
         // split input with/without (raw) query
-        final URI resource = new URI(input.getScheme(), input.getUserInfo(), input.getHost(), input.getPort(), input.getPath(), null, null);
+        // When the URI specifies multiple host / port pairs getHost() will not
+        // work, so we use getAuthority() instead.
+        final URI resource = new URI(input.getScheme(), input.getAuthority(), input.getPath(), null, null);
         String itemName = AlarmURI.getRawQueryParametersValues(input).get(AlarmURI.QUERY_PARAMETER_ITEM_NAME);
         itemName = itemName != null ? URLDecoder.decode(itemName, StandardCharsets.UTF_8) : null;