test, travis: Quieter testing with a new -qq mode

test, travis: Quieter testing with a new -qq mode

Introduce a new -qq mode for our integration test framework,
and make travis use it.

The new -qq mode sets MSGLEVEL to 1. In MSGLEVEL=1, no messages
are generated for passed tests, and all testcase filenames are
printed in the same line.

Also install first in travis, do not ls the installed output
and run the install with chronic, so we only get output if it
failed.

Gbp-Dch: ignore