Adds a single threaded flow conductor

Creates a new conductor module that can be used
to connect into the jobboard, engine, and persistence
mechanism.

This commit adds in support for a simple conductor
that will run jobs in its own thread and will dispatch
them, and consume/abandon them.

Implements: blueprint generic-flow-conductor

Change-Id: Ic610bc825506db57b0c4364b0fc588b51d453a76
Fix docstring list format

Change-Id: Ia79560e965e94e2e4ce18f4667c33ae577b327ed
Merge "Adds a single threaded flow conductor"
Merge "Fix docstring list format"