extra/travis-testing: improve teardown in run-test-environment
extra/travis-testing: improve teardown in run-test-environment

include the $TEST_COMPOSE_PATH in the teardown command.

this is important e.g. for tenantadm, which is not included in
our default compose files that make up the $COMPOSE_CMD. the test
compose defines it as a completely new service.

the result is that after teardown, any new service in the test compose
is not killed (orphaned containers). a secondary effect is that the coverage
report is never generated/sent.

this fix is also important for other closed features/services.

Issues: MEN-1075

Changelog: None

Signed-off-by: mchalczynski <3a897b56ed6fc284ae11e3e7ec3ea48d098a7178@rndity.com>

pasinskim/integration,pasinskim/integration,pasinskim/integration,GregorioDiStefano/integration,GregorioDiStefano/integration