rewrite launcher

two modes:
  * standalone (failsafe) if no ip is defined
  * boostrap if ip set in policy_server.dat
add a "class" android

specialize some path (/system/bin/) for this class.
Warning:
  * Need busybox for route (unavailable in toolbox) and ps (output not parsable
by cfengine)
  * uname cannot determine if we are linux or android. We do that at compile
time with -DANDROID
doc + minor changes