A atualização do Homebrew para Python 2.7.10_2 faz com que os pacotes falhem com 'imagem não encontrada'

Após uma atualização do Homebrew usando

brew update
brew upgrade --all

que resulta na atualização do Python para 2.7.10_2, pip (e muitos outros scripts) falha com

cffi.ffiplatform.VerificationError: importing '/usr/local/lib/python2.7/site-packages/cryptography/_Cryptography_cffi_a269d620xd5c405b7.so': dlopen(/usr/local/lib/python2.7/site-packages/cryptography/_Cryptography_cffi_a269d620xd5c405b7.so, 2): Library not loaded: /usr/local/lib/libssl.1.0.0.dylib
  Referenced from: /usr/local/lib/python2.7/site-packages/cryptography/_Cryptography_cffi_a269d620xd5c405b7.so
  Reason: image not found

O que posso fazer para restaurar ou ajustar minha configuração Python para que funcione novamente? O que o Homebrew fez para destruí-lo?

Traceback (most recent call last):
  File "/usr/local/bin/eb", line 7, in <module>
    from ebcli.core.ebcore import main
  File "/usr/local/lib/python2.7/site-packages/ebcli/core/ebcore.py", line 43, in <module>
    from . import globals, base, io, hooks
  File "/usr/local/lib/python2.7/site-packages/ebcli/core/hooks.py", line 20, in <module>
    from ..lib import aws
  File "/usr/local/lib/python2.7/site-packages/ebcli/lib/aws.py", line 19, in <module>
    import botocore.session
  File "/usr/local/lib/python2.7/site-packages/ebcli/bundled/botocore/session.py", line 27, in <module>
    import botocore.credentials
  File "/usr/local/lib/python2.7/site-packages/ebcli/bundled/botocore/credentials.py", line 30, in <module>
    from botocore.utils import InstanceMetadataFetcher, parse_key_val_file
  File "/usr/local/lib/python2.7/site-packages/ebcli/bundled/botocore/utils.py", line 25, in <module>
    from botocore.vendored import requests
  File "/usr/local/lib/python2.7/site-packages/ebcli/bundled/botocore/vendored/requests/__init__.py", line 53, in <module>
    from .packages.urllib3.contrib import pyopenssl
  File "/usr/local/lib/python2.7/site-packages/ebcli/bundled/botocore/vendored/requests/packages/urllib3/contrib/pyopenssl.py", line 55, in <module>
    import OpenSSL.SSL
  File "/usr/local/lib/python2.7/site-packages/OpenSSL/__init__.py", line 8, in <module>
    from OpenSSL import rand, crypto, SSL
  File "/usr/local/lib/python2.7/site-packages/OpenSSL/rand.py", line 11, in <module>
    from OpenSSL._util import (
  File "/usr/local/lib/python2.7/site-packages/OpenSSL/_util.py", line 7, in <module>
    binding = Binding()
  File "/usr/local/lib/python2.7/site-packages/cryptography/hazmat/bindings/openssl/binding.py", line 114, in __init__
    self._ensure_ffi_initialized()
  File "/usr/local/lib/python2.7/site-packages/cryptography/hazmat/bindings/openssl/binding.py", line 126, in _ensure_ffi_initialized
    cls._modules,
  File "/usr/local/lib/python2.7/site-packages/cryptography/hazmat/bindings/utils.py", line 31, in load_library_for_binding
    lib = ffi.verifier.load_library()
  File "/usr/local/lib/python2.7/site-packages/cffi/verifier.py", line 97, in load_library
    return self._load_library()
  File "/usr/local/lib/python2.7/site-packages/cffi/verifier.py", line 207, in _load_library
    return self._vengine.load_library()
  File "/usr/local/lib/python2.7/site-packages/cffi/vengine_cpy.py", line 155, in load_library
    raise ffiplatform.VerificationError(error)
cffi.ffiplatform.VerificationError: importing '/usr/local/lib/python2.7/site-packages/cryptography/_Cryptography_cffi_a269d620xd5c405b7.so': dlopen(/usr/local/lib/python2.7/site-packages/cryptography/_Cryptography_cffi_a269d620xd5c405b7.so, 2): Library not loaded: /usr/local/lib/libssl.1.0.0.dylib
  Referenced from: /usr/local/lib/python2.7/site-packages/cryptography/_Cryptography_cffi_a269d620xd5c405b7.so
  Reason: image not found

OSX 10.10.4; Homebrew 0.9.5