Travis support for the acceptance tests

This enables the execution of the acceptance tests on Travis.

Because the Travis environment is based on Ubuntu Trusty, it requires
the python3-pip and python3.4-venv packages.

Signed-off-by: Cleber Rosa <crosa@redhat.com>
Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
Acked-by: Wainer dos Santos Moschetta <wainersm@redhat.com>
Reviewed-by: Caio Carrara <ccarrara@redhat.com>
Message-Id: <20181018153134.8493-4-crosa@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>

.travis.yml

@@ -117,6 +117,14 @@ matrix:
     - env: CONFIG="--target-list=x86_64-softmmu"
       python:
         - "3.6"
+    # Acceptance (Functional) tests
+    - env: CONFIG="--python=/usr/bin/python3 --target-list=x86_64-softmmu"
+           TEST_CMD="make AVOCADO_SHOW=app check-acceptance"
+      addons:
+        apt:
+          packages:
+            - python3-pip
+            - python3.4-venv
     # Using newer GCC with sanitizers
     - addons:
         apt: