prune out all linux backend -specific code

this is now in warden-linux

Signed-off-by: Brannon Jones <brannon.jones@tier3.com>
redo godeps

Signed-off-by: Brannon Jones <brannon.jones@tier3.com>
prune linux backend -specific stuff from Makefile

Signed-off-by: Brannon Jones <brannon.jones@tier3.com>