[ONOS-6410] flexible configuration datastore specifier.

- added completer to netconf-config-get

Change-Id: I7cc88637bd51d9f4bea7d906346ffacfbd8706a6
diff --git a/protocols/netconf/ctl/src/main/resources/OSGI-INF/blueprint/shell-config.xml b/protocols/netconf/ctl/src/main/resources/OSGI-INF/blueprint/shell-config.xml
index 72e3087..f40d464 100644
--- a/protocols/netconf/ctl/src/main/resources/OSGI-INF/blueprint/shell-config.xml
+++ b/protocols/netconf/ctl/src/main/resources/OSGI-INF/blueprint/shell-config.xml
@@ -29,6 +29,7 @@
             <action class="org.onosproject.netconf.cli.impl.NetconfConfigGetCommand"/>
             <completers>
                 <ref component-id="deviceIdCompleter"/>
+                <ref component-id="targetConfigurationsCompleter"/>
                 <null/>
             </completers>
         </command>
@@ -44,5 +45,6 @@
     </command-bundle>
 
     <bean id="deviceIdCompleter" class="org.onosproject.cli.net.DeviceIdCompleter"/>
+    <bean id="targetConfigurationsCompleter" class="org.onosproject.netconf.cli.impl.completers.DatastoreIdCompleter"/>
 
 </blueprint>