Fix handling of state transition to config mode

We have found, in production usage, a race condition in the transition to config mode.

If a sufficient number of events is being received, the reply to the FeaturesRequest may be received before the datapath is able to move into CONFIG_DISPATCHER state. As a result, the EventOFPSwitchFeatures handler may never fire (because the reply is received before the datapath has changed state).

This patch also includes a minor typo fix.

Signed-off-by: Victor J. Orlikowski <vjo@duke.edu>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>

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