Pin Juju 2.8.3

Updates the juju version and also pins the charmed bundle
versions.

Increases the install timeout by checking for 10 minutes
where no services progress at all, vs 10 minutes total
time.

Fixes bug 1229

Change-Id: I95db91162ad646a2d04b351558ae5f8b64ea579c
Signed-off-by: beierlm <mark.beierl@canonical.com>