Don't enable the dstat service in CI jobs

We still are seeing regular job failures because the pcp package fails
to install. Assume that we can still enable it on demand when someone
needs to debug specific job issues, let us just disable it by default.

Related-Bug: 1943184
Signed-off-by: Dr. Jens Harbott <harbott@osism.tech>
Change-Id: I32ef8038e21c818623db9389588b3c6d3f98dcad
1 file changed