avocado.plugins.vm: Add missing param for compatibility

We missed that on the whiteboard work.

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>
avocado.core.output: Add missing attribute for OutputManager

So the vm plugin can correctly determine the logs dir.

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>
.travis.yml: Add apt-get update

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>
Merge pull request #126 from lmr/fix-vm-plugin

Fix vm plugin
avocado.test: export environment variables to tests.

Export environment variables to the running test.
Really effective when using drop-in tests, that can make use of shell
variables "AVOCADO_*".

Example:

Export variable AVOCADO_VERSION with the current version of Avocado,
then the drop-in test can use $AVOCADO_VERSION within, and so on.

Signed-off-by: Ruda Moura <rmoura@redhat.com>
Merge pull request #128 from ruda/export_variables

avocado.test: export environment variables to tests.