Mount an EBS volume

    Args:
        volume (str): EBS volume ID
        device (str): default /dev/xvdf
        mountpoint (str): default /mnt/data
        fstype (str): default ext4

def mount_volume(volume, device='/dev/xvdf', mountpoint='/mnt/data', fstype='ext4'):
    '''
    Mount an EBS volume

    Args:
        volume (str): EBS volume ID
        device (str): default /dev/xvdf
        mountpoint (str): default /mnt/data
        fstype (str): default ext4
    '''
    _ec2().attach_volume(volume, _host_node()['id'], device)
    time.sleep(1)
    sudo('mkdir -p "%s"' % mountpoint)
    sudo('mount -t "%s" "%s" "%s"' % (fstype, device, mountpoint))