LU-14506 hsm: correct default stripe offset in import

LU-14506 hsm: correct default stripe offset in import

In lhsmtool_posix, when calling llapi_hsm_import(), pass a stripe
offset of -1 rather than 0 to select the default. Add sanity-hsm
test_11c() to check that a file may be imported to a directory with a
default striping specifing a pool that does not include OST0000.

Signed-off-by: John L. Hammond <jhammond@whamcloud.com>
Change-Id: I40636c0620b2f9314eb13bf23a8cf6d02990f851
Reviewed-on: https://review.whamcloud.com/41978
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Yingjin Qian <qian@ddn.com>