Enable deferred device deletion if supported
Enable deferred device deletion if supported

If docker version has deferred device deletion facility, use it by
default. Docker version 1.9 onwards supports it.

This will allow docker not to block behind container removal (device
deletion) when device/mount leaks into other name space. Container
can still be deleted and device will be removed when last user
goes away.

Signed-off-by: Vivek Goyal <61d11262d0d9873ddb5a887f48fcb04e8c5973d0@redhat.com>

thescriptbender/container-storage-setup,shishir-a412ed/docker-storage-setup