LU-8346 tests: remove spaces around fail_val

LU-8346 tests: remove spaces around fail_val

conf-sanity test 93 tries to set fail_loc and fail_val
with the command 'lctl set_param fail_val = 10 fail_loc...'.
fail_val should have no spaces before and after the
equals sign.

This patch is backport from master branch:
Lustre-commit: Iaa2bff1750a2afa96a73a452a0c098ae92f7616c
Lustre-change: https://review.whamcloud.com/34155

Test-Parameters: trivial mdscount=2 mdtcount=4 envdefinitions=ONLY=93 testlist=conf-sanity
Signed-off-by: James Nunez <jnunez@whamcloud.com>
Change-Id: Iaa2bff1750a2afa96a73a452a0c098ae92f7616c
Reviewed-on: https://review.whamcloud.com/34226
Tested-by: Jenkins
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>