fix invoke(skip_if_running=True)
fix invoke(skip_if_running=True)

zaro0508/jenkinsapi,aerickson/jenkinsapi,zaro0508/jenkinsapi,JohnLZeller/jenkinsapi,imsardine/jenkinsapi,JohnLZeller/jenkinsapi,imsardine/jenkinsapi,jduan/jenkinsapi,salimfadhley/jenkinsapi,mistermocha/jenkinsapi,domenkozar/jenkinsapi,mistermocha/jenkinsapi,JohnLZeller/jenkinsapi,mistermocha/jenkinsapi,aerickson/jenkinsapi,domenkozar/jenkinsapi,salimfadhley/jenkinsapi,jduan/jenkinsapi,imsardine/jenkinsapi,zaro0508/jenkinsapi