core: removed default_config:

- constants in core.default_config moved to core.constants
    - removed unused host.getConst and host.setConst
    - APP_NAME* used where it make sense

src/core/xmpp.py

@@ -18,6 +18,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 from sat.core.i18n import _
+from sat.core.constants import Const as C
 from twisted.internet import task, defer
 from twisted.words.protocols.jabber import jid, xmlstream
 from wokkel import client, disco, xmppim, generic, compat, delay, iwokkel
@@ -475,7 +476,7 @@ class SatIdentityHandler(XMPPHandler):
     implements(iwokkel.IDisco)
 
     def getDiscoInfo(self, requestor, target, nodeIdentifier=''):
-        return [disco.DiscoIdentity(u"client", u"pc", u"Salut à Toi")]
+        return [disco.DiscoIdentity(u"client", u"pc", C.APP_NAME)]
 
     def getDiscoItems(self, requestor, target, nodeIdentifier=''):
         return []