Backport #311 #332
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Backport #311 #332
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Rewrite startup/shutdown logic to simplify shutdown signaling. All cleanup is now run from deferred functions in the main function. Add two new config options to set the read and write ends of a pair of pipes. This is used as a simple mechanism for a parent process to communicate with, observe, and manage the lifetime of a child dcrd process. When the RX (read end) pipe is closed, clean shutdown automatically begins. Add a new flag --lifetimeevents to create and send lifetime event notifications over the TX (write end) pipe during bringup and shutdown. This allows the parent process to observe which subsystems are currently starting, running, and stopping. Fixes btcsuite#297. Fixes btcsuite#298.
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This is a backport of PR #311 for the release-0.4.0 branch.