LU-11215 tests: replace "large_xattr" with "ea_inode"

LU-11215 tests: replace "large_xattr" with "ea_inode"

Change the test scripts over to using the "ea_inode" name, since
this is what the upstream e2fsprogs is using.  The "large_xattr"
feature name was only ever used in the Lustre-patched e2fsprogs.

Don't try to turn off "ea_inode" feature on the targets anymore,
it's not supported by upstream e2fsprogs.

e2fsprogs commit: 5b72578279fe2470e682692a15d70a43d9289e0f

Test-Parameters: trivial testlist=conf-sanity
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Signed-off-by: Li Dongyang <dongyangli@ddn.com>
Change-Id: I83bd303827fa28050d1d6d2416b2d630dc94ec12
Reviewed-on: https://review.whamcloud.com/33012
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>