LU-2406 tests: remove USE_OFD from test-framework

LU-2406 tests: remove USE_OFD from test-framework

Remove the old USE_OFD from test-framework.sh, since this is no
longer needed for master, but it confuses interop testing when
run with b2_3 (where it hits LU-1883 and causes random failures).

Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: I417ac3eb5b2cbb8b4cebfc5d7f3cd2cab1b0974d
Reviewed-on: http://review.whamcloud.com/4727
Tested-by: Hudson
Reviewed-by: Mike Pershin <mike.pershin@intel.com>
Reviewed-by: Jian Yu <jian.yu@intel.com>
Reviewed-by: Li Wei <wei.g.li@intel.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>