busybox: remove syslog-startup.conf if sysvinit not in DISTRO_FEATURES

busybox: remove syslog-startup.conf if sysvinit not in DISTRO_FEATURES

sysvinit and systemd have different ideas about configuration files (or
environment files in systemd), so basically we can't use the same one in
both cases.

To avoid confusion, this patch removes syslog-startup.conf if 'sysvinit'
is not in DISTRO_FEATURES.

[YOCTO #4837]
[YOCTO #4860]

(From OE-Core rev: 89f62147a61108b4be40001e1fbe3be33bacf00b)

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>