CORD-2083 Initial commit for Internet Emulator service

Change-Id: Iab0c0ebe6b14be10abfb9c06da893fc669506ffe
diff --git a/xos/synchronizer/steps/sync_internetemulatorserviceinstance.py b/xos/synchronizer/steps/sync_internetemulatorserviceinstance.py
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+++ b/xos/synchronizer/steps/sync_internetemulatorserviceinstance.py
@@ -0,0 +1,60 @@
+
+# Copyright 2017-present Open Networking Foundation
+#
+# 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.
+
+
+import os
+import sys
+from synchronizers.new_base.SyncInstanceUsingAnsible import SyncInstanceUsingAnsible
+from synchronizers.new_base.modelaccessor import *
+from xos.logger import Logger, logging
+
+parentdir = os.path.join(os.path.dirname(__file__), "..")
+sys.path.insert(0, parentdir)
+
+logger = Logger(level=logging.INFO)
+
+class SyncInternetEmulatorServiceInstance(SyncInstanceUsingAnsible):
+
+    provides = [InternetEmulatorServiceInstance]
+
+    observes = InternetEmulatorServiceInstance
+
+    requested_interval = 0
+
+    template_name = "internetemulatorsesrviceinstance_playbook.yaml"
+
+    service_key_name = "/opt/xos/synchronizers/internetemulator/internetemulator_private_key"
+
+    watches = [ModelLink(ServiceDependency,via='servicedependency')]
+
+    def __init__(self, *args, **kwargs):
+        super(SyncInternetEmulatorInstance, self).__init__(*args, **kwargs)
+
+    def get_internetemulator(self, o):
+        if not o.owner:
+            return None
+
+        internetemulator = InternetEmulatorService.objects.filter(id=o.owner.id)
+
+        if not internetemulator:
+            return None
+
+        return internetemulator[0]
+
+    # Gets the attributes that are used by the Ansible template but are not
+    # part of the set of default attributes.
+    def get_extra_attributes(self, o):
+        fields = {}
+        return fields
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