Add OpenSSL as dependency for P12 generation

.travis.yml

@@ -25,3 +25,4 @@ addons:
     - python-jinja2
     - python-configparser
     - python-pyasn1
+    - python-openssl

certidude/authority.py

@@ -258,7 +258,6 @@ def generate_pkcs12_bundle(common_name, key_size=4096, owner=None):
     try:
         from OpenSSL import crypto
     except ImportError:
-        logger.error("For P12 bundles please install pyOpenSSL: pip install pyOpenSSL")
         raise
     else:
         p12 = crypto.PKCS12()