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.

Lustre-commit: 9a1f327a76f72c7713e53d8b354ff7f0e32be870
Lustre-change: https://review.whamcloud.com/34721

LU-12261 tests: Race between exec and truncate

Execing '$tdir/sleep' with & doesn't guarantee the file is
actually open before returning, so it is sometimes losing
the race with truncate, resulting in errors like this:
/usr/lib64/lustre/tests/sanity.sh: line 4172:
/mnt/lustre/d43b.sanity/sleep: Text file busy

Where $tdir/sleep gets ETXTBSY, instead of truncate as
expected.

A 1 second delay should be enough to guarantee exec wins
the race vs truncate.

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

Lustre-commit: c64855fca1504bddcb0fc7ad7316d8d6b20a9c6f
Lustre-change: https://review.whamcloud.com/34791

Change-Id: Iaec3433f03aab23583052373e5f0252d9eac7f04
Signed-off-by: Alex Zhuravlev <bzzz@whamcloud.com>
Signed-off-by: Patrick Farrell <pfarrell@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: James Nunez <jnunez@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/34955
Tested-by: Jenkins
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Yang Sheng <ys@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>