Issue #566: Deleted test_mapping_file

Signed-off-by: abhishek-s-a <a_sa@dellteam.com>

control_plane/test/test_mapping_file

@@ -1,2 +0,0 @@
-Mac,Hostname,IP
-xx:yy:zz:aa:bb,validation-host21,172.20.0.21