Initial check-in Open ROADM app v1.2.1 (ONOS-5354).

Change-Id: I077b40c308efe257af0e23f0d87de1215c3789ad
diff --git a/apps/openroadm/yangmodel/src/main/yang/org-openroadm-maintenance-loopback.yang b/apps/openroadm/yangmodel/src/main/yang/org-openroadm-maintenance-loopback.yang
new file mode 100644
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+module org-openroadm-maintenance-loopback {
+  namespace "http://org/openroadm/maintenance-loopback";
+  prefix org-openroadm-maint-loopback;
+
+  organization "Open ROADM MSA";
+  contact
+    "OpenROADM.org";
+  description
+    "YANG definitions for maintenance loopback.
+     
+     Copyright of the Members of the Open ROADM MSA Agreement dated (c) 2016, 
+     AT&T Intellectual Property.  All other rights reserved.
+     
+     Redistribution and use in source and binary forms, with or without modification, 
+     are permitted provided that the following conditions are met:
+     
+     * Redistributions of source code must retain the above copyright notice, this 
+       list of conditions and the following disclaimer.
+     * Redistributions in binary form must reproduce the above copyright notice, 
+       this list of conditions and the following disclaimer in the documentation and/or 
+       other materials provided with the distribution.
+     * Neither the Members of the Open ROADM MSA Agreement nor the names of its 
+       contributors may be used to endorse or promote products derived from this software 
+       without specific prior written permission.
+     
+     THIS SOFTWARE IS PROVIDED BY THE MEMBERS OF THE OPEN ROADM MSA  AGREEMENT ''AS IS'' 
+     AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
+     WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
+     IN NO EVENT THE MEMBERS OF THE OPEN ROADM MSA  AGREEMENT BE LIABLE FOR ANY DIRECT, 
+     INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 
+     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;  LOSS OF USE, DATA, 
+     OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
+     WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
+     ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
+     POSSIBILITY OF SUCH DAMAGE.";
+
+  revision 2016-10-14 {
+    description
+      "Version 1.2";
+  }
+
+  grouping maint-loopback {
+    container maint-loopback {
+      leaf enabled {
+        type boolean;
+        default "false";
+        description
+          "loopback operation enable flag";
+      }
+      leaf type {
+        when "../enabled = 'true'";
+        type enumeration {
+          enum "fac" {
+            value 0;
+            description
+              "pre-FEC Loopback in the facility direction";
+          }
+          enum "term" {
+            value 1;
+            description
+              "Loopback in the terminal direction";
+          }
+          enum "fac2" {
+            value 2;
+            description
+              "post-FEC Loopback in the facility direction";
+          }
+        }
+        default "fac";
+        description
+          "Set Loopback type (or direction).";
+      }
+    }
+  }
+}