tests: Use the Python SkipTest if possible

This makes nosetests optional at least in theory.
Recent nose versions already do the same thing internally.

modules/biplan/test.py

@@ -17,10 +17,10 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with weboob. If not, see <http://www.gnu.org/licenses/>.
 
-from nose.plugins.skip import SkipTest
-from weboob.tools.test import BackendTest
 from datetime import datetime
 
+from weboob.tools.test import BackendTest, SkipTest
+
 
 class BiplanTest(BackendTest):
     BACKEND = 'biplan'

modules/feedly/test.py

@@ -17,8 +17,7 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with weboob. If not, see <http://www.gnu.org/licenses/>.
 
-from nose.plugins.skip import SkipTest
-from weboob.tools.test import BackendTest
+from weboob.tools.test import BackendTest, SkipTest
 
 
 class FeedlyTest(BackendTest):

modules/grooveshark/test.py

@@ -17,9 +17,8 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with weboob. If not, see <http://www.gnu.org/licenses/>.
 
-from nose.plugins.skip import SkipTest
-from weboob.tools.test import BackendTest
 from weboob.capabilities.audio import BaseAudio
+from weboob.tools.test import BackendTest, SkipTest
 
 
 class GroovesharkTest(BackendTest):

modules/hybride/test.py

@@ -17,10 +17,10 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with weboob. If not, see <http://www.gnu.org/licenses/>.
 
-from nose.plugins.skip import SkipTest
-from weboob.tools.test import BackendTest
 from datetime import datetime
 
+from weboob.tools.test import BackendTest, SkipTest
+
 
 class HybrideTest(BackendTest):
     BACKEND = 'hybride'

modules/pastebin/test.py

@@ -17,11 +17,9 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with weboob. If not, see <http://www.gnu.org/licenses/>.
 
-from nose.plugins.skip import SkipTest
-
 from weboob.capabilities.base import NotLoaded
 from weboob.capabilities.paste import PasteNotFound
-from weboob.tools.test import BackendTest
+from weboob.tools.test import BackendTest, SkipTest
 
 from .browser import LimitExceeded
 

modules/twitter/test.py

@@ -18,9 +18,9 @@
 # along with weboob. If not, see <http://www.gnu.org/licenses/>.
 
 import itertools
-from nose.plugins.skip import SkipTest
-from weboob.tools.test import BackendTest
+
 from weboob.capabilities.base import BaseObject
+from weboob.tools.test import BackendTest, SkipTest
 
 
 class TwitterTest(BackendTest):