use the new sudo detection magic from remoto

Signed-off-by: Alfredo Deza <alfredo.deza@inktank.com>
remove the sudo checks in ceph-deploy

Signed-off-by: Alfredo Deza <alfredo.deza@inktank.com>
bump remoto requirement

Signed-off-by: Alfredo Deza <alfredo.deza@inktank.com>
install epel-release package from CentOS Extras repository

detail information:
[CentOS-announce] The epel-release package is now available via Extras
http://lists.centos.org/pipermail/centos-announce/2014-September/020526.html