Add systemd sigrtmin3/container compat to runit; customize pkg versions.
systemd has a behavior that is very nice for containers. If you send it SIGRTMIN+3 (37 on some Linux systems), it will halt the machine (see https://www.freedesktop.org/software/systemd/man/systemd.html). Further, if the env var "container" is set, systemd will actually exit. 9001-systemd-sigrtmin3-compat.diff adds this functionality to runit. Prior to this, runit would of course just sit and spin after entering stage 3 (its halt/shutdown/reboot target). Now if the env var "container" is set, runit will exit. Plus runit can be signaled by Docker (or whatever container manager) to shutdown immediately via SIGRTMIN+3. (Also, this commit adds the custom "emulab" bit into the package version strings.)
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