ceph: change ceph.file.layout.* implementation, content
ceph: change ceph.file.layout.* implementation, content

Implement a new method to generate the ceph.file.layout vxattr using
the new framework.

Use 'stripe_unit' instead of 'chunk_size'.

Include pool name, either as a string or as an integer.

Signed-off-by: Sage Weil <6dd34506bbd5e58221bbb3e4732d97c91f02277b@inktank.com>
Reviewed-by: Sam Lang <70ab3b98ad075c66e7d3501cb42b80a7e41da316@inktank.com>

TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas