I am unable to login my centos7 image..

I have downloaded the 1st image from below link.. http://cloud.centos.org/centos/7/images/

Have used below text file for mapping the key-pair..

cat centos7.txt
#cloud-config
chpasswd:
 list: |
   root:stackops
   centos:stackops
expire: False

Also created key file using ssh-key and import to nova key file..

nova keypair-list
+-----------+-------------------------------------------------+
| Name      | Fingerprint                                     |
+-----------+-------------------------------------------------+
| cloud-key | b2:bd:77:1a:0d:78:73:fa:ae:b2:ed:bc:dd:10:41:88 |
+-----------+-------------------------------------------------+

Have create instance using nova command with below parameter. But still I am unable to loging the same password "stackops".

nova boot --flavor m1.small --image CentOS-7-x86_64 --nic net-id=75b34ee0-ffbf-4dcb-9511-b270b0229f99 --security-group default --key-name cloud-key --user-data=centos7.txt test2

Please advise me to fix the issue