rook-client-python: update to update-june-21

Signed-off-by: Sage Weil <sage@newdream.net>

diff --git a/src/pybind/mgr/rook/rook-client-python b/src/pybind/mgr/rook/rook-client-python
index 0b46d500a741afabe5c4efd1bb07e6f8903f0ef0..c4467b8ad17ae7fe682779f26335ded0e6615f98 160000 (submodule)
--- a/src/pybind/mgr/rook/rook-client-python
+++ b/src/pybind/mgr/rook/rook-client-python
@@ -1 +1 @@
-Subproject commit 0b46d500a741afabe5c4efd1bb07e6f8903f0ef0
+Subproject commit c4467b8ad17ae7fe682779f26335ded0e6615f98