refactor usr/net-test/Hakefile
refactor usr/net-test/Hakefile

* Add the dependency to posixcompat, since net-test.c uses the functions read
  and write.

* Remove hard tabs to comply with our CodingStyle.

utsav2601/cmpe295A,utsav2601/cmpe295A,BarrelfishOS/barrelfish,BarrelfishOS/barrelfish,mslovy/barrelfish,8l/barrelfish,8l/barrelfish,8l/barrelfish,linusyang/barrelfish,mslovy/barrelfish,BarrelfishOS/barrelfish,kishoredbn/barrelfish,8l/barrelfish,BarrelfishOS/barrelfish,utsav2601/cmpe295A,kishoredbn/barrelfish,mslovy/barrelfish,kishoredbn/barrelfish,BarrelfishOS/barrelfish,kishoredbn/barrelfish,mslovy/barrelfish,kishoredbn/barrelfish,linusyang/barrelfish,linusyang/barrelfish,linusyang/barrelfish,BarrelfishOS/barrelfish,kishoredbn/barrelfish,mslovy/barrelfish,utsav2601/cmpe295A,utsav2601/cmpe295A,8l/barrelfish,BarrelfishOS/barrelfish,BarrelfishOS/barrelfish,mslovy/barrelfish,8l/barrelfish,linusyang/barrelfish,BarrelfishOS/barrelfish,utsav2601/cmpe295A