When starting in debug mode, starts the daemon without going through systemctl

This fixes the problem that debug options for daemons were ignored and sets
the following behaviour for the daemons when -debug 1 is given
 * start on foreground with debug ouput on the console
 * do not start a sytemd unit

Starting the systemd unit in debug mode makes less sense because:
 * systemd will put the daemon in the background
 * systemd ignores environment variables so the only way to start
 the daemon with options would be through reading a config file

tested with pveproxy, pve-ha-lrm, pve-ha-crm