Update Tiny root disk to 1GB

    'm1.tiny' now has root_gb=1

    `root_gb=0` indicates that a disk-resize shouldn't occur which is not
    something that a default flavor should have enabled. This is
    especially true of one named 'tiny' since the unresized image could
    potentially be very large, leading to the unexpected result of a
    'tiny' instance consuming a massive amount of disk.

fixes bug 1195569

Change-Id: I9588ac78927e9bd69f68fa0a9478728e4e473e80
Changes swift xfs inode advice to be more modern

In past couple of years, the XFS team has greatly improved inode use in
xfs. With more recent kernels, there is no performance penalty for
using the default inode size, and a smaller inode size gives us
improvements in other areas where disk access is involved.

fixes bug 1195768

Change-Id: I5882cd0decf362dfa23bd2f0382f1687322a8d38
Merge "Changes swift xfs inode advice to be more modern"
Merge "Update Tiny root disk to 1GB"