Added ability to remove host by CLI and by the provider on device/port down events.

Change-Id: I28de4b6b5bbfb5a00f35e1808bcd916369d7d1a4
diff --git a/cli/src/main/resources/OSGI-INF/blueprint/shell-config.xml b/cli/src/main/resources/OSGI-INF/blueprint/shell-config.xml
index 073d237..1621069 100644
--- a/cli/src/main/resources/OSGI-INF/blueprint/shell-config.xml
+++ b/cli/src/main/resources/OSGI-INF/blueprint/shell-config.xml
@@ -207,6 +207,13 @@
             <action class="org.onlab.onos.cli.net.HostsListCommand"/>
         </command>
         <command>
+            <action class="org.onlab.onos.cli.net.HostRemoveCommand"/>
+            <completers>
+                <ref component-id="hostIdCompleter"/>
+                <null/>
+            </completers>
+        </command>
+        <command>
             <action class="org.onlab.onos.cli.net.AddressBindingsListCommand"/>
         </command>