fix removing hosts failure on MacOSX
fix removing hosts failure on MacOSX

ben-rosio/vagrant-hostsupdater,Guerrerito/vagrant-hostsupdater,radeksimko/vagrant-hostsupdater,meitar/vagrant-hostsupdater,aki2o/vagrant-hostsupdater,ericmann/vagrant-hostsupdater,cogitatio/vagrant-hostsupdater,SEEK-Jobs/vagrant-multi-hostsupdater