Fix dependency on subprocess

certidude/common.py

@@ -2,6 +2,7 @@
 import os
 import click
 import ipaddress
+import subprocess
 
 def ip_network(j):
     return ipaddress.ip_network(unicode(j))

certidude/decorators.py

@@ -3,7 +3,6 @@ import ipaddress
 import json
 import logging
 import os
-import subprocess
 import types
 from datetime import date, time, datetime, timedelta
 from urlparse import urlparse