Moving to ubuntu 18 and fixing UT's

Change-Id: Id4bf535bd1567d4adefed95641271e2bf6b447fe
Signed-off-by: wahidw <abdulwahid.w@nokia.com>
diff --git a/RELNOTES b/RELNOTES
index 354ff2a..a4726b0 100644
--- a/RELNOTES
+++ b/RELNOTES
@@ -1,3 +1,6 @@
+### v0.5.6-1
+* Moving to ubuntu 18 and fixing UT's
+
 ### v0.5.6
 * Fix to convert service name to IP during Route update Request