spdk: update SPDK to v17.10

Signed-off-by: Kefu Chai <kchai@redhat.com>

diff --git a/src/spdk b/src/spdk
index 7b7f2aa6854745caf6e2803133043132ca400285..b17d4d91359078a00ec60e6016b8c5c9c6b41a91 160000 (submodule)
--- a/src/spdk
+++ b/src/spdk
@@ -1 +1 @@
-Subproject commit 7b7f2aa6854745caf6e2803133043132ca400285
+Subproject commit b17d4d91359078a00ec60e6016b8c5c9c6b41a91