lxc: allow multiple init systems in DISTRO_FEATURES
lxc: allow multiple init systems in DISTRO_FEATURES

Add handling for distros with both systemd and sysvinit by passing
multiple init systems to configure with --with-init-script=

Signed-off-by: Erik Botö <7c963dec65b645142621cb8557316bb9472161b8@pelagicore.com>
Signed-off-by: Bruce Ashfield <284cc737d174a260eec2a2a6324a304f84b1ae0f@windriver.com>

cardoe/meta-virtualization,fbertux/meta-virtualization,lgirdk/meta-virtualization,cardoe/meta-virtualization,lgirdk/meta-virtualization,fbertux/meta-virtualization,lgirdk/meta-virtualization,lgirdk/meta-virtualization,cjp256/meta-virtualization,cjp256/meta-virtualization,cardoe/meta-virtualization,fbertux/meta-virtualization,cjp256/meta-virtualization,lgirdk/meta-virtualization