VM Runner Plugin: move tests to its own directory

Move tests to the plugin's own directory.
Signed-off-by: NCleber Rosa <crosa@redhat.com>

optional_plugins/runner_vm/setup.py

@@ -25,6 +25,7 @@ setup(name='avocado-framework-plugin-runner-vm',
       packages=find_packages(),
       include_package_data=True,
       install_requires=['avocado-framework-plugin-runner-remote', 'libvirt-python'],
+      test_suite='tests',
       entry_points={
           'avocado.plugins.cli': [
               'vm = avocado_runner_vm:VMCLI',

selftests/run

@@ -36,7 +36,9 @@ def test_suite():
     plugins = (('avocado-framework-plugin-varianter-yaml-to-mux',
                 'varianter_yaml_to_mux'),
                ('avocado-framework-plugin-runner-remote',
-                'runner_remote'))
+                'runner_remote'),
+               ('avocado-framework-plugin-runner-vm',
+                'runner_vm'))
     for plugin_name, plugin_dir in plugins:
         if plugin_available(plugin_name):
             path = os.path.join(basedir, 'optional_plugins',