Allow a non-shaded bookkeeper client to connect to a shaded bookie

[sijie]

BUG REPORT

Describe the bug

We introduced #1217 to address the problem for a shaded bookkeeper client to connect to a non-shaded bookie. It worked out well.

However if I run a bookie with dependencies shaded (e.g. in integration tests), a normal (non-shaded) bookie client can't connect to bookie.

To Reproduce

You have to shade the bookkeeper-server in order to reproduce it.

Expected behavior

A normal client should be able to connect to a shaded bookie

Screenshots

Additional context

N/A