pid1: propagate the original command line when reexecuting
    
    When we reexec the manager in a container, we lose configuration settings on
    the kernel command line:
    
      $ systemd-nspawn -M rawhide -b systemd.status-unit-format=name systemd.show-status=yes
      ...
      # tr '\0' ' ' 
      /usr/lib/systemd/systemd systemd.status_unit_format=combined systemd.show-status=yes
      # sudo systemctl daemon-reexec
      # tr '\0' ' ' 
      /usr/lib/systemd/systemd --system --deserialize 20
    
      This means that after daemon-reexec, the settings that we gain from the
      commandline are reset to defaults.
    
    So let's reeexecute with the original arguments copied over, modulo some
    filtering.
    
    (cherry picked from commit 846f1da465beda990c1c01346311393f485df467)