LU-12195 tests: use sleep instead of wrapped multiop

LU-12195 tests: use sleep instead of wrapped multiop

in sanity/43* and sanity/14* tests as multiop is not a binary,
but libtool-wrapped script. the tests fail when started from a
build tree.

Change-Id: Iaec3433f03aab23583052373e5f0252d9eac7f04
Signed-off-by: Alex Zhuravlev <bzzz@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/34721
Tested-by: Jenkins
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>