LU-10447 tests: replace $SETSTRIPE/$GETSTRIPE with $LFS

LU-10447 tests: replace $SETSTRIPE/$GETSTRIPE with $LFS

$SETSTRIPE and $GETSTRIPE were needed when we used the
standalone 'lstripe' utility. 'lstripe' hasn't been used
for years and we need to clean up all remnants of it.

Replace all instances of $SETSTRIPE with '$LFS setstripe'
and $GETSTRIPE with '$LFS getstripe' in the conf-sanity,
ost-pools and sanity-quota test suites.

Test-Parameters: trivial testlist=conf-sanity
Test-Parameters: testlist=ost-pools,sanity-quota
Signed-off-by: James Nunez <jnunez@whamcloud.com>
Change-Id: I9c5a3fd3a7ba8bf1e65da34880dff8df8d4e7b75
Reviewed-on: https://review.whamcloud.com/33917
Tested-by: Jenkins
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Wei Liu <sarah@whamcloud.com>
Reviewed-by: Elena Gryaznova <c17455@cray.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>