[Bug] Removing inner TaskExecutor to call DMI

- Removing TaskExecutor from cps-ncmp-service package as anyways the
  call coming over from the cps-ncmp-rest layer is managed by a
  different thread executor(CpsNcmpTaskExecutor)
- Provided 60secs timeout value.
- Spawning new thread from a different executor might not be needed
- Removing @Async from a non spring managed method as its of no use

Issue-ID: CPS-2150
Change-Id: Ic99632983aff2c40df81421d782cf98ec600fc41
Signed-off-by: mpriyank <priyank.maheshwari@est.tech>
diff --git a/docs/release-notes.rst b/docs/release-notes.rst
index e79a188..2202d11 100644
--- a/docs/release-notes.rst
+++ b/docs/release-notes.rst
@@ -39,6 +39,7 @@
 Bug Fixes
 ---------
 3.4.7
+    - `CPS-2150 <https://jira.onap.org/browse/CPS-2150>`_ Fix for Async task execution failed by TimeoutException.
 
 Features
 --------