Fix validations_inputs temporary file name
Fix validations_inputs temporary file name

All the validations were failing when running through Mistral with a
`sudo` command not allowed issue [1] due to a typo in the file name.

This patch fixes the name of the temporary files containing potential
ansible variables.

[1] mistral : command not allowed ; TTY=unknown ; PWD=/ ; USER=root
 ; COMMAND=/usr/bin/chown -h validations: /tmp/validation_inputs_PoJRZa

Change-Id: I6699bbbab5cb15a8fd200c144a3d575e9f29ca37
Signed-off-by: Gael Chamoulaud <68646863a1a9108d0246eb96cb6356f9fa9a34f3@redhat.com>

openstack/tripleo-common,openstack/tripleo-common