LU-11594 test: re-enable sanity test 103a for ARM

LU-11594 test: re-enable sanity test 103a for ARM

The fix for LU-12657 resolves why sanity test 103a failes with newer
kernels. The ARM platform has been failing for this reason so lets
re-enable the test.

Test-Parameters: trivial testgroup=review-ldiskfs-arm

Change-Id: I8b56b7926de7a155ea1429a47d6cbab7a7836bf1
Signed-off-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-on: https://review.whamcloud.com/34819
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: James Nunez <jnunez@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Alex Zhuravlev <bzzz@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>