Merge branch 'privsep'

Merge branch 'privsep'

* privsep:
  server: Introduce privilege separation.
  server: Zap spurious space output by a_vformat.
  server: Make a_vformat public.
  server: Set admin socket permissions to match user.
  client: Capture server stderr and send it to the logfile.
  client: Better logging infrastructure.
  client: Clean up variable declarations.
  client: New options for setting user and group identities.
  client: Function for inserting arguments.
  peer, tunnels: New file-descriptor opening interface.

Conflicts:

	server/Makefile.am