Remove fallback scripts and whitelist

They have been extracted to a new fallback-scripts.git repository.

Closes ticket 27914.

changes/ticket27914

+  o Removed features:
+    - The scripts used to generate and maintain the list of fallback
+      directories have been extracted into a new "fallback-scripts"
+      repository. Closes ticket 27914.

scripts/maint/generateFallbackDirLine.py

-#!/usr/bin/env python
-
-# Generate a fallback directory whitelist/blacklist line for every fingerprint
-# passed as an argument.
-#
-# Usage:
-# generateFallbackDirLine.py fingerprint ...
-
-import sys
-import urllib2
-
-import stem.descriptor.remote
-import stem.util.tor_tools
-
-if len(sys.argv) <= 1:
-  print('Usage: %s fingerprint ...' % sys.argv[0])
-  sys.exit(1)
-
-for fingerprint in sys.argv[1:]:
-  if not stem.util.tor_tools.is_valid_fingerprint(fingerprint):
-    print("'%s' isn't a valid relay fingerprint" % fingerprint)
-    sys.exit(1)
-
-  try:
-    desc = stem.descriptor.remote.get_server_descriptors(fingerprint).run()[0]
-  except urllib2.HTTPError as exc:
-    if exc.code == 404:
-      print('# %s not found in recent descriptors' % fingerprint)
-      continue
-    else:
-      raise
-
-  if not desc.dir_port:
-    print("# %s needs a DirPort" % fingerprint)
-  else:
-    ipv6_addresses = [(address, port) for address, port, is_ipv6 in desc.or_addresses if is_ipv6]
-    ipv6_field = ' ipv6=[%s]:%s' % ipv6_addresses[0] if ipv6_addresses else ''
-    print('%s:%s orport=%s id=%s%s # %s' % (desc.address, desc.dir_port, desc.or_port, fingerprint, ipv6_field, desc.nickname))

scripts/maint/lookupFallbackDirContact.py

-#!/usr/bin/env python
-
-# Lookup fallback directory contact lines for every fingerprint passed as an
-# argument.
-#
-# Usage:
-# lookupFallbackDirContact.py fingerprint ...
-
-import sys
-
-import stem.descriptor.remote as remote
-
-if len(sys.argv) <= 1:
-  print "Usage: {} fingerprint ...".format(sys.argv[0])
-  sys.exit(-1)
-
-# we need descriptors, because the consensus does not have contact infos
-descriptor_list = remote.get_server_descriptors(fingerprints=sys.argv[1:]).run()
-
-descriptor_list_fingerprints = []
-for d in descriptor_list:
-  assert d.fingerprint in sys.argv[1:]
-  descriptor_list_fingerprints.append(d.fingerprint)
-  print "{} {}".format(d.fingerprint, d.contact)
-
-for fingerprint in sys.argv[1:]:
-  if fingerprint not in descriptor_list_fingerprints:
-    print "{} not found in current descriptors".format(fingerprint)