komenco: Go back to Guzzle 5
komenco: Go back to Guzzle 5

As Guzzle 6 has a complete new design we switch back to version 5 to
prevent the update of the Jira and Confluence clients.

Change-Id: Ie7614b09214a2e0e1502090ea601160503ab54b4

bmwcarit/komenco,bmwcarit/komenco,bmwcarit/komenco