[ONOS-4513] Move optical Intent compilers out to optical-model (3/3)

- core/net is now optical clean
- reverting part of Change-Id: Ib8ddac6e93327ade9d42984d8eba66be7047d051
 which lead to loss of package import information, causing OSGi issue

Change-Id: Ie6b16abd3ecc872f0920d29c7577a10c44091af6
diff --git a/core/net/src/main/java/org/onosproject/net/intent/impl/compiler/VirtualNetworkIntentCompiler.java b/core/net/src/main/java/org/onosproject/net/intent/impl/compiler/VirtualNetworkIntentCompiler.java
index 1fdebe1..8c04c6a 100644
--- a/core/net/src/main/java/org/onosproject/net/intent/impl/compiler/VirtualNetworkIntentCompiler.java
+++ b/core/net/src/main/java/org/onosproject/net/intent/impl/compiler/VirtualNetworkIntentCompiler.java
@@ -34,10 +34,10 @@
 import org.onosproject.net.Link;
 import org.onosproject.net.Path;
 import org.onosproject.net.intent.Intent;
+import org.onosproject.net.intent.IntentCompilationException;
 import org.onosproject.net.intent.IntentService;
 import org.onosproject.net.intent.Key;
 import org.onosproject.net.intent.PointToPointIntent;
-import org.onosproject.net.intent.impl.IntentCompilationException;
 import org.onosproject.net.topology.TopologyService;
 import org.slf4j.Logger;