avocado.plugins.manager: Make loading plugins robust.

Make loading plugins robust (ignore and log errors when loading).

Signed-off-by: Ruda Moura <rmoura@redhat.com>
Merge pull request #16 from ruda/robust_plugin_loader

avocado.plugins.manager: Make loading plugins robust.
avocado.plugins: Turn the lister into a core plugin

The lister plugin is useful, as it allows people
to see present, active/inactive plugins. So split
it from the examples area.

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>
examples: Move avocado hello to examples/plugins and rename

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>
Merge pull request #19 from avocado-framework/split-example-plugins

Split example plugins
avocado.plugins.xunit: Add missing license header

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>
unittests/runtests.py: Add missing license header

Signed-off-by: Lucas Meneghel Rodrigues <lmr@redhat.com>
TestResult: refactored  code to instantiate Test Results.

Signed-off-by: Ruda Moura <rmoura@redhat.com>