agent: Fix test-textstream tests for UTF8 handling changes

This is a regression.

Reviewed-by: Patrick Uiterwijk <puiterwijk@redhat.com>
daemon: More reliable testing of CGroupMonitor

It's not trivial to reliably predict the amount of CPU used
between the two timestamp intervals. So skip this check for now.

Reviewed-by: Patrick Uiterwijk <puiterwijk@redhat.com>
web: Fix test-chan.html test due to missing $cockpit

This is a regression.

Reviewed-by: Patrick Uiterwijk <puiterwijk@redhat.com>