avocado: Print config file paths in datadir and list subcommands

It is useful information to the user where the config file
is, to reinforce where avocado is picking the default values.
So add it to the output of `datadir` and `list` subcommands.
Signed-off-by: NLucas Meneghel Rodrigues <lmr@redhat.com>

avocado/plugins/datadir.py

@@ -15,6 +15,7 @@
 from avocado.plugins import plugin
 from avocado.core import output
 from avocado.core import data_dir
+from avocado.settings import settings
 
 
 class DataDirList(plugin.Plugin):
@@ -34,6 +35,7 @@ class DataDirList(plugin.Plugin):
 
     def run(self, args):
         view = output.View()
+        view.notify(event="message", msg='Config file path: %s' % settings.config_path)
         view.notify(event="message", msg='Avocado Data Directories:')
         view.notify(event="message", msg='    base dir        ' + data_dir.get_base_dir())
         view.notify(event="message", msg='    tests dir       ' + data_dir.get_test_dir())

avocado/plugins/runner.py

@@ -25,6 +25,7 @@ from avocado.core import output
 from avocado.utils import path
 from avocado import sysinfo
 from avocado import job
+from avocado.settings import settings
 
 
 class TestLister(plugin.Plugin):
@@ -66,6 +67,7 @@ class TestLister(plugin.Plugin):
                     blength = clength
                 test_dirs.append((t.split('.')[0], os.path.join(base_test_dir, t)))
         format_string = "    %-" + str(blength) + "s %s"
+        view.notify(event="message", msg='Config file path: %s' % settings.config_path)
         view.notify(event='message', msg='Tests dir: %s' % base_test_dir)
         if len(test_dirs) > 0:
             view.notify(event='message', msg=format_string % ('Alias', 'Path'))