Revert "Disable DocTor checks for dannenberg"

This reverts commit 3f1c5f67 and 7b121dc3.

consensus_health_checker.py

@@ -28,11 +28,6 @@ Runlevel = stem.util.enum.UppercaseEnum('NOTICE', 'WARNING', 'ERROR')
 DIRECTORY_AUTHORITIES = stem.directory.Authority.from_cache()
 del DIRECTORY_AUTHORITIES['tor26']  # DirPort does not service requests without a '.z' suffix
 
-# dannenberg runs tor's long-term-stable release which does not support the
-# most recent consensus method, breaking its ability to sign the consensus
-
-del DIRECTORY_AUTHORITIES['dannenberg']
-
 EMAIL_SUBJECT = 'Consensus issues'
 BANDWIDTH_AUTHORITIES = ('moria1', 'gabelmoo', 'maatuska', 'Faravahar', 'bastet', 'longclaw')
 
@@ -646,9 +641,6 @@ def has_authority_flag(latest_consensus, consensuses, votes):
   if 'tor26' in seen_authorities:
     seen_authorities.remove('tor26')
 
-  if 'dannenberg' in seen_authorities:
-    seen_authorities.remove('dannenberg')
-
   known_authorities = set(DIRECTORY_AUTHORITIES.keys())
   missing_authorities = known_authorities.difference(seen_authorities)
   extra_authorities = seen_authorities.difference(known_authorities)

descriptor_checker.py

@@ -67,8 +67,6 @@ def main():
       continue  # authority doesn't vote in the consensus
     elif authority.nickname == 'tor26':
       continue  # DirPort doesn't accept requests without a .z suffix
-    elif authority.nickname == 'dannenberg':
-      continue  # unable to sign consensus (see commit 3f1c5f6)
 
     log.debug("Downloading the consensus from %s..." % authority.nickname)