init/import path: move DEFAULT_CONFIG to __init__ for faster shared import

proxy: move certauth/openssl init to only happen in enable_https_proxy is set to
make slow openssl import run only when used

pywb/__init__.py

@@ -1,4 +1,8 @@
 import os
 
+DEFAULT_CONFIG = 'pywb/default_config.yaml'
+
 def get_test_dir():
-    return os.path.dirname(os.path.realpath(__file__)) + '/../sample_archive/'
+    return os.path.join(os.path.dirname(os.path.realpath(__file__)),
+                                        '..',
+                                        'sample_archive') + os.path.sep

pywb/framework/proxy.py

@@ -12,8 +12,6 @@ from pywb.utils.wbexception import BadRequestException
 
 from pywb.utils.bufferedreaders import BufferedReader
 
-from certauth import CertificateAuthority, openssl_avail
-
 from proxy_resolvers import ProxyAuthResolver, CookieResolver
 
 
@@ -92,6 +90,8 @@ class ProxyRouter(object):
             self.ca = None
             return
 
+        from certauth import CertificateAuthority, openssl_avail
+
         if not openssl_avail:  # pragma: no cover
             print('HTTPS proxy not available as pyopenssl is not installed')
             print('Please install via "pip install pyopenssl" ' +

pywb/webapp/pywb_init.py

@@ -17,14 +17,12 @@ from handlers import StaticHandler
 from handlers import DebugEchoHandler, DebugEchoEnvHandler
 from cdx_api_handler import CDXAPIHandler
 
+from pywb import DEFAULT_CONFIG
 
 import os
 import logging
 
 
-#=================================================================
-DEFAULT_CONFIG = 'pywb/default_config.yaml'
-
 #=================================================================
 class DictChain:
     def __init__(self, *dicts):