test: Flush stdout after printing result
test: Flush stdout after printing result

This is the last place in run-tests that uses print() without flushing.
As the output is heavily interleaved with stderr and direct
sys.stdout.buffer writes, unflushed print()s mess up the log file.

garrett/cockpit,cockpit-project/cockpit,garrett/cockpit,mvollmer/cockpit,cockpit-project/cockpit,martinpitt/cockpit,martinpitt/cockpit,cockpit-project/cockpit,cockpit-project/cockpit,mvollmer/cockpit,martinpitt/cockpit,martinpitt/cockpit,garrett/cockpit,mvollmer/cockpit,garrett/cockpit,garrett/cockpit,cockpit-project/cockpit,mvollmer/cockpit,mvollmer/cockpit,martinpitt/cockpit