Don't set ANSIBLE_HOSTS inside the env-setup script

hacking/env-setup

@@ -3,7 +3,6 @@ PREFIX_PYTHONPATH="`pwd`/lib/ansible:`pwd`/lib"
 PREFIX_PATH="`pwd`/bin"
 PREFIX_MANPATH="`pwd`/docs/man"
 PREFIX_ANS_LIBRARY="`pwd`/library"
-PREFIX_ANS_HOSTS="`pwd`/examples/ansible_hosts"
 
 echo "Prefixing PYTHONPATH with $PREFIX_PYTHONPATH"
 export PYTHONPATH=$PREFIX_PYTHONPATH:$PYTHONPATH
@@ -16,6 +15,3 @@ export MANPATH=$PREFIX_MANPATH:$MANPATH
 
 echo "Setting ANSIBLE_LIBRARY to ${PREFIX_ANS_LIBRARY}"
 export ANSIBLE_LIBRARY=${PREFIX_ANS_LIBRARY}
-
-echo "Setting ANSIBLE_HOSTS to ${PREFIX_ANS_HOSTS}"
-export ANSIBLE_HOSTS=${PREFIX_ANS_HOSTS}