Fix the should_install_gradle? check
Fix the should_install_gradle? check

gradle.zip unpacks to include its version number.

Change-Id: I65739a2c276648c8d2234bba66f6de7b0615b351

yazgoo/chef-exhibitor,SimpleFinance/chef-exhibitor,PaytmLabs/chef-exhibitor,SimpleFinance/chef-exhibitor,SimpleFinance/chef-exhibitor,yazgoo/chef-exhibitor,GannettDigital/chef-exhibitor,yazgoo/chef-exhibitor,PaytmLabs/chef-exhibitor,PaytmLabs/chef-exhibitor,GannettDigital/chef-exhibitor,GannettDigital/chef-exhibitor