osdc/Objecter: resend command map version checks on reconnect

We already do this for Ops and LingerOps, but missed this when we added
CommandOps to the mix.  The result is that an ill-timed mon disconnect will
leave a command map check (and thus the command) hanging.

This misbehavior was introduced when CommandOp was introduced, back in
commit 2e172225b01561bb7988b6d86d96ff4b9c1c5762, and we failed to fix it
in 8808ca57c652502d9cf803b0dc53673ca9dd62af.

Fixes: #5493
Signed-off-by: Sage Weil <sage@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>