Update Arch Linux template and add common configuration files

Update Arch Linux template and add common configuration files

Move common container configuration entries into template config.
Remove unnecessary service symlinking and configuration entries, as well as
guest configs and other redundant configuration, fix minor script bugs.
Clean up template command line, add -d option to allow disabling services.
Also enable getty's on all configured ttys to allow logins via lxc-console,
set lxc.tty value corresponding to default Arch /etc/securetty configuration.

This patch simplifies Arch Linux template a bit, while fixing some
longstanding issues. It also provides common configuration based on
files provided for Fedora templates.

Signed-off-by: Alexander Vladimirov <alexander.idkfa.vladimirov@gmail.com>
Acked-by: Stéphane Graber <stgraber@ubuntu.com>