Finit v4.17

Changes

• Add Plymouth boot splash plugin to manage the plymouthd lifecycle across boot,
  switch_root, and shutdown. Activated by the splash kernel command line
  argument. By Aaron Andersen
• Add tty: option for run/task/service stanzas to acquire a controlling
  terminal. The device is opened as stdin, set as the session's controlling TTY
  via TIOCSCTTY, and TERM is set automatically — linux for virtual terminals
  and vt102 for serial lines. By Ollie Gutierrez
• Improve console output atomicity at boot and shutdown: description and status
  ([ OK ] / [FAIL]) are emitted in a single write so kernel messages cannot
  split them. If output has been scrolled away, the description is re-printed
  before the final status line. Console buffer is drained with tcdrain(2) and
  ANSI attributes are reset before handing control back to the kernel at
  shutdown/reboot

Fixes

• Fix reverse-dependency condition handling on reload: when a service without
  SIGHUP support is reloaded, its condition is now cleared immediately so
  dependents transition to STOPPING before SIGTERM is sent to the parent,
  preventing them from crashing with an incremented restart counter
• Fix /var/tmp mode in tmpfiles.d/var.conf from 0777 to 1777 (sticky bit)
  to match /tmp, by Aaron Andersen
• Fix potential memory corruption in config parser: stale pointer captures of
  PATH and SHELL at startup could dangle after environment modification;
  conf_reset_env() now reads from the live environment instead, by Vasily Zubko
• Fix plugin name registration: replace __FILE__ macro with explicit string
  literals in all plugin structs and debug messages, preventing subtle build-
  system–dependent macro expansion issues, by Vasily Zubko