Jenkins plugin setup

[jodok.glabasna (Jodok)]

The special agent agent_jenkins currently can only handle jenkins installation on the root URI path.

• https://jenkins.company.tld works
• https://jenkins.company.tld/jenkins/ wont work

For the needed permissions there is an KB article

• https://checkmk.atlassian.net/wiki/spaces/KB/pages/9470593/Jenkins+Special+Agent+and+access+rights