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