Bug 40008: Remove dannenberg special-casing

danneberg temporarily migrated to FreeBSD to fix the LibreSSL issue
(see: tpo/core/tor#40128). Andreas agreed, too, to remove the previous
special treatment for dannenberg which got implemented earlier this
year while the directory authorities were under heavy load.

consensus_health_checker.py

@@ -29,7 +29,6 @@ DIRECTORY_AUTHORITIES = stem.directory.Authority.from_cache()
 
 DIRAUTH_SKIP_CHECKS = (
   'tor26',   # tor26 DirPort does not service requests without a .z suffix
-  'dannenberg', # al asked for skipping the checks for now (2020-06-18)
 )
 
 EMAIL_SUBJECT = 'Consensus issues'
@@ -644,8 +643,6 @@ def has_authority_flag(latest_consensus, consensuses, votes):
 
   known_authorities = set(DIRECTORY_AUTHORITIES.keys())
   missing_authorities = known_authorities.difference(seen_authorities)
-  # Discard dannenberg for now until tor#40128 is solved, see #40005.
-  missing_authorities.discard('dannenberg')
   extra_authorities = seen_authorities.difference(known_authorities)
 
   issues = []

descriptor_checker.py

@@ -31,7 +31,6 @@ error: %s
 
 DIRAUTH_SKIP_CHECKS = (
   'tor26',   # tor26 DirPort does not service requests without a .z suffix
-  'dannenberg', # al asked for skipping the checks for now (2020-06-18)
 )
 
 log = util.get_logger('descriptor_checker')