[#3866]: "certbot certificates" checks validity with OpenSSL (#4155)

* cert signature validation for certificates subcommand + a test

* refactoring validation + adding in a check for making sure that the private key matches the certificate

* adding testing certs

* assertIsNone(x) -> assertEqual(None,x) to unbreak the py2.6 tests

* modifying test_verifu_renewable_cert_failure to hopefully appease python 3 test timeouts

* updating cryptography to be >=1.2 so that we can use verify

* removing unused, old testing certificate

* adding better error handling/logging

* adding test for IOError

* switching to a 2048 bit rsa key

1 files changed, 1 insertions, 1 deletions

diff --git a/setup.py b/setup.py
index 80050a2c9..6ffc9a134 100644
--- a/setup.py
+++ b/setup.py
@@ -41,7 +41,7 @@ install_requires = [
     # in which we added 2.6 support (see #2243), so we relax the requirement.
     'ConfigArgParse>=0.9.3',
     'configobj',
-    'cryptography>=0.7',  # load_pem_x509_certificate
+    'cryptography>=1.2',  # load_pem_x509_certificate
     'mock',
     'parsedatetime>=1.3',  # Calendar.parseDT
     'PyOpenSSL',