[Jenkins-infra] Fine-grained Artifactory upload permissions

[Daniel Beck]

> On 23.08.2016, at 00:07, Michael Neale <mneale at cloudbees.com> wrote:
> 
> I see the wiki has been updated. If someone opens a HOSTING ticket would it make sense to have the permission granted as part of that? 

Definitely, but this requires extending both JIRA (new fields) and the bot (new actions, very different from anything it does so far), so it's probably going to take a while. So I added it to the docs for now.

Tracking as INFRA-904