0.9.17

Cumulative release of the 0.9.17-alpha.1 prerelease. The summary below covers the user-visible outcome of that work; the per-change detail remains in the prerelease section below.

Fixed

• Idle intercom brokers now exit after the 5-second shutdown window even when no session ever registered, including sockets that close before register. An evicted incumbent does not delete a successor's socket or pid file (#2765).
• Idle brokers now exit after the 5-second shutdown window even when no session ever registered, including sockets that close before register. An evicted incumbent does not delete a successor's socket or pid file (#2765).