Merge pull request #53 from alfredodeza/master

test ipv6 addresses as well as ipv4
Exit from ceph-deploy script with return value of main()
Signed-off-by: Ryan Moe <rmoe@mirantis.com>
Merge pull request #54 from rmoe/master

Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
Reviewed-by: Sage Weil <sage.weil@inktank.com>