migrationitem: add an "unversioned name" property

This can be used to retrieve the version information from a versionned hint;
for unversionned hints, it is effectively a synonym for "name".

Signed-off-by: Adam D. Barratt <adam@adam-barratt.org.uk>

migrationitem.py

@@ -56,6 +56,15 @@ class MigrationItem:
         if self.is_removal:
             self._suite = 'testing'
 	    
+        if self._versionned:
+            parts = self._name.split('/', 3)
+            if len(parts) == 1 or self._architecture == 'source':
+                self._uvname = parts[0]
+            else:
+                self._uvname = "%s/%s" % (parts[0], parts[1])
+        else:
+            self._uvname = self._name
+
     name = property(_get_name, _set_name)
 
     @property
@@ -78,6 +87,10 @@ class MigrationItem:
     def version(self):
         return self._version
 
+    @property
+    def uvname(self):
+        return self._uvname
+
 class HintItem(MigrationItem):
     def __init__(self, name = None):
         MigrationItem.__init__(self, name = name, versionned = True)