ureport: uReport_ContactEmail setting can be left empty

Signed-off-by: Jakub Filak <jfilak@redhat.com>
forbidden words: add OpenStack related strings

"token" - Thanks Nathan Kinder <nkinder@redhat.com>
"key"   - googled for "OpenStack environment variables"
"https" - forgotten

Signed-off-by: Jakub Filak <jfilak@redhat.com>