add Bug::File::Fs.fsname for tests

get filesystem type name for given path

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46041 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
revert File::Statfs [Feature #9772]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46042 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
I suspect such early wakeup is because of automatic time correction

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@46043 b2dd03c8-39d4-4d8f-98ff-823fe69b080e