[ONOS-5925] Removing 1.6 deprecated optical ports

Change-Id: I2c8583323e6c99d08f3568a81941036fa8e949d8
diff --git a/drivers/optical/src/main/java/org/onosproject/driver/optical/query/DefaultTributarySlotQuery.java b/drivers/optical/src/main/java/org/onosproject/driver/optical/query/DefaultTributarySlotQuery.java
index c424272..ef0fb7c 100644
--- a/drivers/optical/src/main/java/org/onosproject/driver/optical/query/DefaultTributarySlotQuery.java
+++ b/drivers/optical/src/main/java/org/onosproject/driver/optical/query/DefaultTributarySlotQuery.java
@@ -82,15 +82,9 @@
 
     private Set<TributarySlot> queryOchTributarySlots(Port ochPort) {
         OduSignalType signalType = null;
-        if (ochPort instanceof org.onosproject.net.OchPort) {
-            // remove once deprecation of old OchPort model is done
-            signalType = ((org.onosproject.net.OchPort) ochPort).signalType();
-        }
         if (ochPort instanceof OchPort) {
             signalType = ((OchPort) ochPort).signalType();
-        }
-
-        if (signalType == null) {
+        } else {
             log.warn("{} was not an OchPort", ochPort);
             return Collections.emptySet();
         }
@@ -108,15 +102,9 @@
 
     private Set<TributarySlot> queryOtuTributarySlots(Port otuPort) {
         OtuSignalType signalType = null;
-        if (otuPort instanceof org.onosproject.net.OtuPort) {
-            // remove once deprecation of old OtuPort model is done
-            signalType = ((org.onosproject.net.OtuPort) otuPort).signalType();
-        }
         if (otuPort instanceof OtuPort) {
             signalType = ((OtuPort) otuPort).signalType();
-        }
-
-        if (signalType == null) {
+        } else {
             log.warn("{} was not an OtuPort", otuPort);
             return Collections.emptySet();
         }