[ONOS-3642] Add GUI Meter View

This implements the web GUI meter view.
Current implementation uses the group table icon for meter,
and the revised meter icon will be updated in following commit.
See ONOS-3645 for detail.

Change-Id: Iaa2e673ef83024135d757a2aaec1c31a87263217
diff --git a/web/gui/src/main/webapp/app/view/group/group.html b/web/gui/src/main/webapp/app/view/group/group.html
index 538b979..9f4a70e 100644
--- a/web/gui/src/main/webapp/app/view/group/group.html
+++ b/web/gui/src/main/webapp/app/view/group/group.html
@@ -1,19 +1,3 @@
-<!--
-  ~ Copyright 2015 Open Networking Laboratory
-  ~
-  ~ Licensed under the Apache License, Version 2.0 (the "License");
-  ~ you may not use this file except in compliance with the License.
-  ~ You may obtain a copy of the License at
-  ~
-  ~     http://www.apache.org/licenses/LICENSE-2.0
-  ~
-  ~ Unless required by applicable law or agreed to in writing, software
-  ~ distributed under the License is distributed on an "AS IS" BASIS,
-  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-  ~ See the License for the specific language governing permissions and
-  ~ limitations under the License.
-  -->
-
 <!-- Group partial HTML -->
 <div id="ov-group">
     <div class="tabular-header">
@@ -46,6 +30,11 @@
 
             <div class="current-view"
                  icon icon-id="groupTable" icon-size="36"></div>
+
+            <div class="active"
+                 icon icon-id="meterTable" icon-size="36"
+                 tooltip tt-msg="meterTip"
+                 ng-click="nav('meter')"></div>
         </div>
     </div>