tests for install_plugin and install_plugins
tests for install_plugin and install_plugins

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