LU-8941 tests: remove wrong redirection syntaxes

LU-8941 tests: remove wrong redirection syntaxes

The "2&>" redirection syntax is wrong. Replace it with
what was probably intended by the test writer.

Test-Parameters: trivial testlist=replay-single,sanityn

Signed-off-by: Gregoire Pichon <gregoire.pichon@bull.net>
Change-Id: I8322bc853316a2580572c415fc1af4b73377fbc2
Reviewed-on: https://review.whamcloud.com/27351
Tested-by: Jenkins
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>