Adding clustering failure test cases

Usage : pybot -v LEADER:10.195.128.18 -v PORT:8181 -v FOLLOWER1:10.195.128.35 -v FOLLOWER2:10.195.128.19 -v USERNAME:root -v PASSWORD:Ecp123 -v KARAFHOME:/root/Documents/dist 010_restconf_rpc_crud_test_09_execute_on_last_node.txt

Change-Id: I6e4c00c34cdc9cef74fae65d253656d04c1ce59d
Signed-off-by: Harman Singh <harmasin@cisco.com>