avoid displaying repr of internal classes in user facing messages

The context of the message will tell where the problem was and there is no reason to show
  ... does not exist for this repository <MercurialRepository at /home/marcink/repos/rhodecode>

rhodecode/lib/vcs/backends/git/repository.py

@@ -268,7 +268,7 class GitRepository(BaseRepository):
                 revision = self.revisions[int(revision)]
             except:
                 raise ChangesetDoesNotExistError("Revision %r does not exist "
-                    "for this repository %s" % (revision, self))
+                    "for this repository" % (revision))
 
         elif is_bstr(revision):
             # get by branch/tag name
@@ -283,7 +283,7 class GitRepository(BaseRepository):
 
             elif not pattern.match(revision) or revision not in self.revisions:
                 raise ChangesetDoesNotExistError("Revision %r does not exist "
-                    "for this repository %s" % (revision, self))
+                    "for this repository" % (revision))
 
         # Ensure we return full id
         if not pattern.match(str(revision)):

rhodecode/lib/vcs/backends/hg/repository.py

@@ -405,8 +405,8 class MercurialRepository(BaseRepository
             revision = hex(self._repo.lookup(revision))
         except (IndexError, ValueError, RepoLookupError, TypeError):
             raise ChangesetDoesNotExistError("Revision %r does not "
-                                    "exist for this repository %s" \
-                                    % (revision, self))
+                                    "exist for this repository"
+                                    % (revision))
         return revision
 
     def _get_archives(self, archive_name='tip'):

rhodecode/tests/functional/test_files.py

@@ -294,8 +294,7 removed extra unicode conversion in diff
         msg = """Revision %r does not exist for this repository""" % (rev)
         self.checkSessionFlash(response, msg)
 
-        msg = """%s""" % (HG_REPO)
-        self.checkSessionFlash(response, msg)
+        self.assertEqual('http://localhost/%s/files/tip/' % HG_REPO, response.headers['location'])
 
     def test_raw_file_wrong_f_path(self):
         self.log_user()
@@ -333,8 +332,7 removed extra unicode conversion in diff
         msg = """Revision %r does not exist for this repository""" % (rev)
         self.checkSessionFlash(response, msg)
 
-        msg = """%s""" % (HG_REPO)
-        self.checkSessionFlash(response, msg)
+        self.assertEqual('http://localhost/%s/files/tip/' % HG_REPO, response.headers['location'])
 
     def test_raw_wrong_f_path(self):
         self.log_user()