Add cfme_manageiq_evm_upload_exec.rb

This module exploits a path traversal vulnerability in the "linuxpkgs"
action of "agent" controller of the Red Hat CloudForms Management Engine
5.1 (ManageIQ Enterprise Virtualization Manager 5.0 and earlier).
Clean pull request
Merge pull request #1 from jvazquez-r7/review_2745

Clean pull request
Fix cfme_manageiq_evm_upload_exec according to chat with @rcvalle
Merge pull request #2 from jvazquez-r7/review_2745

Fix cfme_manageiq_evm_upload_exec according to chat with @rcvalle
Land #2745, @rcvalle's exploit for CVE-2013-2068