package/skeleton-init-openrc: add support for starting sysv scripts

package/skeleton-init-openrc: add support for starting sysv scripts

Add an OpenRC service that starts and stops sysv-init scripts. We order
that script 'after local' so that it is started after all other native
openrc services.

Signed-off-by: Michał Łyszczek <michal.lyszczek@bofc.pl>
[yann.morin.1998@free.fr:
  - don't propagate the micro optimisation for running .sh scripts
  - use spaces, not TABs
  - stop services in reverse order
  - reword commit log
]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>