Implement CLI for black hole routes

Change-Id: I9bb2aa8641b780cf90dd8a0aefdc57169c02186f
(cherry picked from commit feadacb580e7d2c325453b3afe474049d27d11d8)
diff --git a/apps/segmentrouting/app/src/main/resources/OSGI-INF/blueprint/shell-config.xml b/apps/segmentrouting/app/src/main/resources/OSGI-INF/blueprint/shell-config.xml
index 71f986b..f61569a 100644
--- a/apps/segmentrouting/app/src/main/resources/OSGI-INF/blueprint/shell-config.xml
+++ b/apps/segmentrouting/app/src/main/resources/OSGI-INF/blueprint/shell-config.xml
@@ -134,6 +134,9 @@
                 <null/>
             </completers>
         </command>
+        <command>
+            <action class="org.onosproject.segmentrouting.cli.BlackHoleCommand"/>
+        </command>
     </command-bundle>
 
     <bean id="nullCompleter" class="org.apache.karaf.shell.console.completer.NullCompleter"/>