query/demo: Fix broken shutdown.

Shutdown was being called right away.  That would invalidate db.ctx.
We need to wait to call shutdown until the program is ready to exit.

Copy of v.io/c/11863 by kash

Change-Id: Ic4d4744f6d6214cd095c2b806b62477cb43ec7f6
2 files changed
tree: 6e69fe10d860a2bb2597370dbbaca1e40f650b0e
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