Increase a timeout value from 100ms to 1000ms.
This fixes an occasional unit test failure on (slower) VMs.

Change-Id: I56c1009829efd5af98c62cc4cbff7827406a2fc2
diff --git a/core/net/src/test/java/org/onosproject/net/intent/impl/IntentManagerTest.java b/core/net/src/test/java/org/onosproject/net/intent/impl/IntentManagerTest.java
index 31e0c4a..e21de64 100644
--- a/core/net/src/test/java/org/onosproject/net/intent/impl/IntentManagerTest.java
+++ b/core/net/src/test/java/org/onosproject/net/intent/impl/IntentManagerTest.java
@@ -85,6 +85,7 @@
 
 public class IntentManagerTest {
 
+    private static final int SUBMIT_TIMEOUT_MS = 1000;
     private static final ApplicationId APPID = new TestApplicationId("manager-test");
 
     private IntentManager manager;
@@ -380,7 +381,7 @@
             service.withdraw(intent);
         }
 
-        assertAfter(100, () -> {
+        assertAfter(SUBMIT_TIMEOUT_MS, () -> {
             assertEquals(1L, service.getIntentCount());
             assertEquals(0L, flowRuleService.getFlowRuleCount());
         });