openrc, rc-status, rc-service, rc-update: add pages (#3800)

* rc-status: add page

* openrc: add page

* rc-service: add page

* rc-update: add page

* rc-status: add list all runlevels example

* openrc: fix travis errors

* rc-status: fix travis errors again

* Update pages/linux/rc-update.md

Co-Authored-By: Zlatan Vasović <zlatanvasovic@gmail.com>

* Update pages/linux/rc-status.md

Co-Authored-By: Zlatan Vasović <zlatanvasovic@gmail.com>

Co-authored-by: Zlatan Vasović <zlatanvasovic@gmail.com>

pages/linux/openrc.md

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+# openrc
+
+> The OpenRC service manager.
+> See also `rc-status`, `rc-update`, and `rc-service`.
+> More information: <https://wiki.gentoo.org/wiki/OpenRC>.
+
+- Change to a specific runlevel:
+
+`sudo openrc {{runlevel_name}}`
+
+- Change to a specific runlevel, but don't stop any existing services:
+
+`sudo openrc --no-stop {{runlevel_name}}`

pages/linux/rc-service.md

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+# rc-service
+
+> Locate and run OpenRC services with arguments.
+> See also `openrc`.
+
+- Show a service's status:
+
+`rc-service {{service_name}} status`
+
+- Start a service:
+
+`sudo rc-service {{service_name}} start`
+
+- Stop a service:
+
+`sudo rc-servie {{service_name}} stop`
+
+- Restart a service:
+
+`sudo rc-service {{service_name}} restart`
+
+- Simulate running a service's custom command:
+
+`sudo rc-service --dry-run {{service_name}} {{command_name}}`
+
+- Actually run a service's custom command:
+
+`sudo rc-service {{service_name}} {{command_name}}`
+
+- Resolve the location of a service definition on disk:
+
+`sudo rc-service --resolve {{service_name}}`

pages/linux/rc-status.md

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+# rc-status
+
+> Show status info about runlevels.
+> See also `openrc`.
+
+- Show a summary of services and their status:
+
+`rc-status`
+
+- Include services in all runlevels in the summary:
+
+`rc-status --all`
+
+- List services that have crashed:
+
+`rc-status --crashed`
+
+- List manually started services:
+
+`rc-status --manual`
+
+- List supervised services:
+
+`rc-status --supervised`
+
+- Get the current runlevel:
+
+`rc-status --runlevel`
+
+- List all runlevels:
+
+`rc-status --list`

pages/linux/rc-update.md

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+# rc-update
+
+> Add and remove OpenRC services to and from runlevels.
+> See also `openrc`.
+
+- List all services and the runlevels they are added to:
+
+`rc-update show`
+
+- Add a service to a runlevel:
+
+`sudo rc-update add {{service_name}} {{runlevel}}`
+
+- Delete a service from a runlevel:
+
+`sudo rc-update delete {{service_name}} {{runlevel}}`
+
+- Delete a service from all runlevels:
+
+`sudo rc-update --all delete {{service_name}}`