Install and enable sysstat monitoring suite for integration tests jobs
Install and enable sysstat monitoring suite for integration tests jobs

Both integration and backend-tests jobs are Alpine Linux based, so the
install and setup is slightly different.

Collect also the stats file after each job to facilitate debugging.

Changelog: None

Signed-off-by: Lluis Campos <9244cb41c39addfc5cf236920b776ea2820513d0@northern.tech>

mendersoftware/meta-mender-qemu