Ansible : change StrictHostKeyChecking accept-new to no

Change-Id: Ibc400cd8c40a2f14234751dbd19976eb649a5745
Reviewed-on: https://review.couchbase.org/c/perfrunner/+/191206
Tested-by: Build Bot <[email protected]>
Reviewed-by: Daniel Nagy <[email protected]>

Author: vikas-getconnect

cloud/infrastructure/cloud.ini

@@ -10,4 +10,4 @@ worker_list
 [all:vars]
 ansible_user=root
 ansible_ssh_pass=couchbase
-ansible_ssh_common_args='-o StrictHostKeyChecking=accept-new -o UserKnownHostsFile=/dev/null'
+ansible_ssh_common_args='-o StrictHostKeyChecking=no'