Merge pull request #1475 from telefonicaid/fix/update_subscriptions_device

fix: update subscriptions in device

Author: fgalan

CHANGES_NEXT_RELEASE

@@ -0,0 +1 @@
+- Fix: store device subscriptions updates (#1086)

lib/services/devices/deviceRegistryMongoDB.js

@@ -56,6 +56,7 @@ const attributeList = [
     'timestamp',
     'explicitAttrs',
     'ngsiVersion',
+    'subscriptions',
     'payloadType'
 ];
 
@@ -318,6 +319,7 @@ function update(device, callback) {
             data.explicitAttrs = device.explicitAttrs;
             data.ngsiVersion = device.ngsiVersion;
             data.timestamp = device.timestamp;
+            data.subscriptions = device.subscriptions;
             data.payloadType = device.payloadType;
 
             /* eslint-disable-next-line  new-cap */