Joshua Harlow a8d9ae76fe Have the storage class provide a 'change_flow_state' method ...

Instead of needing the engine method to lock, fetch, check
and then update the flow state it is more appropriate if the
storage class does all these actions itself (therefore hiding
this change from the engine code, making the engine code
that much smaller).

Change-Id: I2a289c2bcabe76728fa8eb26265ce168abf81b7c

2015-08-15 14:08:47 -07:00

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