LU-1732 utils: allow ldiskfs wide striping with ea_inode

LU-1732 utils: allow ldiskfs wide striping with ea_inode

Format the MDT filesystem with the "ea_inode" option by default
so that files can have more than 160 stripes, and large xattrs
over one filesystem block in size (normally 4096 bytes).

Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Signed-off-by: Li Dongyang <dongyangli@ddn.com>
Signed-off-by: Patrick Farrell <pfarrell@whamcloud.com>
Change-Id: I71589c13e59a9d13db3bf075282cf6334b86be30
Reviewed-on: https://review.whamcloud.com/4315
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Oleg Drokin <green@whamcloud.com>