add clear workspace


git-svn-id: https://svn/IT/az/groovy@23564 99cadc30-3bf9-11df-9bc1-510916f65ae8
use short is*() form

git-svn-id: https://svn/IT/az/groovy@23567 99cadc30-3bf9-11df-9bc1-510916f65ae8
Merge remote-tracking branch 'remotes/git-svn'