EX-3687 osp: do force disconnect if import is not ready

EX-3687 osp: do force disconnect if import is not ready

Send OSP_DISCONNECT only on health import. Otherwise,
force local disconnect for unhealthy imports.

Signed-off-by: Mikhail Pershin <mpershin@whamcloud.com>
Change-Id: Icd9f171271f4e17a65503fcc710ad3aaa2b84e1e
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Alex Zhuravlev <bzzz@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/45253
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Andreas Dilger <adilger@whamcloud.com>