LU-11755 ldlm: remove LASSERT() in ns_is_{client,server}()

LU-11755 ldlm: remove LASSERT() in ns_is_{client,server}()

(ns->ns_client == LDLM_NAMESPACE_CLIENT ||
ns->ns_client == LDLM_NAMESPACE_SERVER) implies that
(!(ns->ns_client & ~(LDLM_NAMESPACE_CLIENT |LDLM_NAMESPACE_SERVER)))
is also true, so the latter LASSERT() can be removed from
ns_is_{client,server}().

Signed-off-by: Nikitas Angelinas <nangelinas@cray.com>
Cray-bug-id: LUS-6762
Change-Id: Ib165d97ca397d5109c046415d2ec513357b07cbd
Reviewed-on: https://review.whamcloud.com/33822
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: Jenkins
Reviewed-by: Alexandr Boyko <c17825@cray.com>
Tested-by: Maloo <maloo@whamcloud.com>