OSMENG-987: Implement PrepareVnfWorkflow

Change-Id: Icf3ccfd44160fbc3f2f2d9ec64e360c07fc9bbfa
Signed-off-by: Dario Faccin <dario.faccin@canonical.com>
diff --git a/osm_lcm/temporal/ns_activities.py b/osm_lcm/temporal/ns_activities.py
index 6834eec..eee4325 100644
--- a/osm_lcm/temporal/ns_activities.py
+++ b/osm_lcm/temporal/ns_activities.py
@@ -21,7 +21,6 @@
     ACTIVITY_CHECK_NS_INSTANTIATION_FINISHED,
     ACTIVITY_DEPLOY_NS,
     ACTIVITY_GET_MODEL_INFO,
-    ACTIVITY_PREPARE_VNF_RECORDS,
     ACTIVITY_UPDATE_NS_STATE,
 )
 from osm_common.dataclasses.temporal_dataclasses import (
@@ -84,30 +83,6 @@
         self.db = db
         self.logger = logging.getLogger(f"lcm.act.{self.__class__.__name__}")
 
-    @activity.defn(name=ACTIVITY_PREPARE_VNF_RECORDS)
-    async def prepare_vnf_records(
-        self, ns_instantiate_input: NsInstantiateInput
-    ) -> None:
-        """Prepare VNFs to be deployed: Add namespace to the VNFr.
-
-        Collaborators:
-            DB Write:           vnfrs
-
-        Raises  (Retryable):
-            DbException         If the target DB record does not exist or DB is not reachable.
-
-        Activity Lifecycle:
-            This activity will not report a heartbeat due to its
-            short-running nature.
-
-            As this is a direct DB update, it is not recommended to have
-            any specific retry policy
-
-        """
-        vnfrs = self.db.get_list("vnfrs", {"nsr-id-ref": ns_instantiate_input.ns_uuid})
-        for vnfr in vnfrs:
-            self._prepare_vnf_record(vnfr)
-
     @activity.defn(name=ACTIVITY_GET_MODEL_INFO)
     async def get_model_info(
         self, ns_instantiate_input: NsInstantiateInput
@@ -134,18 +109,11 @@
         model_name = self._get_namespace(ns_uuid, vim_uuid)
         return ModelInfo(vim_uuid, model_name)
 
-    def _get_namespace(self, ns_id: str, vim_id: str) -> str:
+    @staticmethod
+    def _get_namespace(ns_id: str, vim_id: str) -> str:
         """The NS namespace is the combination if the NS ID and the VIM ID."""
         return ns_id[-12:] + "-" + vim_id[-12:]
 
-    def _prepare_vnf_record(self, vnfr: dict) -> None:
-        """Add namespace to the VNFr."""
-        ns_id = vnfr["nsr-id-ref"]
-        vim_id = vnfr["vim-account-id"]
-        namespace = self._get_namespace(ns_id, vim_id)
-        update_namespace = {"namespace": namespace}
-        self.db.set_one("vnfrs", {"_id": vnfr["_id"]}, update_namespace)
-
     @activity.defn(name=ACTIVITY_UPDATE_NS_STATE)
     async def update_ns_state(self, data: UpdateNsStateInput) -> None:
         """