in-band: Delete remaining rules when disabling in-band control.

in_band_destroy() doesn't remove all of the rules that in-band control
adds (and it cannot, because that might require waiting for an existing
asynchronous flow modification or addition to complete), so turning on
other-config:disable-in-band or deleting all of the OpenFlow controllers
did not delete all of the in-band rules.

This commit fixes the problem by making the in-band control object hang
around until all of the flows that it set up have actually been deleted.

This problem was introduced as part of commit 7ee20df "ofproto: Implement
asynchronous OFPT_FLOW_MOD commands."

Reported-by: Brad Hall <brad@nicira.com>

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