template upload scripts refactor

This is an effort to clean up the template uploader scripts and fix a few issues. Template names that include build numbers less than 10 will be 0-padded to ensure they sort correctly. It also adds HHMM timestamps to the end of build names to account for multiple builds occurring in the same day. This update changes the template_upload_vsphere script to use mgmt_sys instead of using pshere directly. This PR is pending some changes to the template_upload_rhevm script that will be added today. Then I'll remove the WIP and put it up for review.