travis.yml: Move gprof/gcov test across to gitlab

travis.yml: Move gprof/gcov test across to gitlab

Similarly to commit 8cdb2cef3f1, move the gprof/gcov test to GitLab.

The coverage-summary.sh script is not Travis-CI specific, make it
generic.

[thuth: Add gcovr and bsdmainutils which are required for the
        coverage-summary.sh script to the ubuntu docker file,
        and use 'check' as test target]

Signed-off-by: Philippe Mathieu-Daudé <[email protected]>
Signed-off-by: Thomas Huth <[email protected]>
Signed-off-by: Alex Bennée <[email protected]>
Reviewed-by: Alex Bennée <[email protected]>
Reviewed-by: Wainer dos Santos Moschetta <[email protected]>
Message-Id: <20201108204535.2319870[email protected]>
Message-Id: <20210211045455[email protected]>
Message-Id: <20210211122750[email protected]>