Keep docstring up to date with the code in basic module
Update CHANGELOG.md

OH NO NAMING CONFLICT
Merge pull request #8488 from bekimb/docstring_basic_module

Keep docstring up to date with the code in basic module
Update no_thanks.md
Fix missing variable initialization for async jid

Fixes #8491
service: test properly whether systemd is running

Use a pure Python reimplementation of the [sd_booted(3)][1] function
from [systemd v210][2].

[1]: http://www.freedesktop.org/software/systemd/man/sd_booted.html
[2]: http://cgit.freedesktop.org/systemd/systemd-stable/tree/src/libsystemd/sd-daemon/sd-daemon.c?id=v210#n465