Support also alternative init(s)

[ldmsys]

Currently, aims are:

• systemd
• sysvinit
• upstart

Less important inits that I want to also support are:

• openrc
• runit
• WSL

[ldmsys]

I will rename "systemd" type to "service" type.

[ldmsys]

deb.types.systemd = "service"

[ldmsys]

Now, we detect destination system's init system.

[ldmsys]

sysvinit: FADe-Archive/deb-build#5 (almost done)

[ldmsys]

sysvinit