Fix VimAdminThread run method

The run_coroutine_threadsafe() function is used to schedule a coroutine object from a different thread and returns a concurrent.futures.Future.
run_coroutine_threadsafe is unnecessary to run the main task and replaced with asyncio.run().

Change-Id: I8ea31828a9798140d596165443bdf26659b4eef8
Signed-off-by: Gulsum Atici <gulsum.atici@canonical.com>
diff --git a/NG-RO/osm_ng_ro/vim_admin.py b/NG-RO/osm_ng_ro/vim_admin.py
index 21e6281..e34cce4 100644
--- a/NG-RO/osm_ng_ro/vim_admin.py
+++ b/NG-RO/osm_ng_ro/vim_admin.py
@@ -380,7 +380,7 @@
         self.logger.info("Starting")
         while not self.to_terminate:
             try:
-                asyncio.run_coroutine_threadsafe(self.main_task(), self.loop)
+                asyncio.run(self.main_task())
             except Exception as e:
                 if not self.to_terminate:
                     self.logger.exception(
@@ -458,12 +458,12 @@
         self.lock_renew.to_terminate = True
 
         if self.aiomain_task_kafka:
-            self.aiomain_task_kafka.cancel()
+            self.loop.call_soon_threadsafe(self.aiomain_task_kafka.cancel())
 
         if self.aiomain_task_vim:
-            self.aiomain_task_vim.cancel()
+            self.loop.call_soon_threadsafe(self.aiomain_task_vim.cancel())
 
         if self.aiomain_task_renew_lock:
-            self.aiomain_task_renew_lock.cancel()
+            self.loop.call_soon_threadsafe(self.aiomain_task_renew_lock.cancel())
 
         self.lock_renew.stop()
diff --git a/releasenotes/notes/fix_vim_adminthread_run_method-7bd0f7c32e932645.yaml b/releasenotes/notes/fix_vim_adminthread_run_method-7bd0f7c32e932645.yaml
new file mode 100644
index 0000000..2ce8bdc
--- /dev/null
+++ b/releasenotes/notes/fix_vim_adminthread_run_method-7bd0f7c32e932645.yaml
@@ -0,0 +1,22 @@
+#######################################################################################
+# Copyright ETSI Contributors and Others.
+#
+# 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.
+#######################################################################################
+---
+fixes:
+  - |
+    The run_coroutine_threadsafe() function is used to schedule a coroutine object from a different thread and returns a concurrent.futures.Future.
+    run_coroutine_threadsafe is unnecessary to run the main task and replaced with asyncio.run().
+