systemd.bbclass: Clean up empty parent directories

Previously, rm_systemd_unitdir() would remove one parent directory of
${systemd_unitdir} if it was empty after removing ${systemd_unitdir}.
rm_sysvinit_initddir() would not remove any parent directory. Thus, if
the only directory created in /etc was /etc/init.d, an empty /etc would
remain after the cleanup and would be packaged.

Simplify rm_systemd_unitdir() and rm_sysvinit_initddir() by rewriting
them in shell, and use rmdir -p to remove all empty parent directories.

(From OE-Core rev: 73159c0bbc636a08934f47690885d75fd37b701a)

Signed-off-by: Peter Kjellerstedt <peter.kjellerstedt@axis.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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