tests: fix rgw multisite vagrant variables

tests: fix rgw multisite vagrant variables

The secondary vagrant variables didn't have the grafana vm variable
set which create an vagrant error.

There was an error loading a Vagrantfile. The file being loaded
and the error message are shown below. This is usually caused by
an invalid or undefined variable.

This patch also changes the ssh-extra-args parameter to ssh-common-args
to get the same values for ssh/sftp/scp. Otherwise we can see warnings
from ansible and some tasks are failing.

[WARNING]: sftp transfer mechanism failed on [mon0]. Use ANSIBLE_DEBUG=1
to see detailed information

It also updates the ssh-common-args value for the rgw-multisite scenario
to reflect the ANSIBLE_SSH_ARGS environment variable value.

Finally changing the IP addresses due to the Vagrant refact done in the
commit 778c51a

Signed-off-by: Dimitri Savineau <dsavinea@redhat.com>