Use certifi for SSL certificates

Certifi keeps an up-to-date list of certs, and
makes it easier to inject extra certificates
when needed.  We often run in to SSL issues
when using the LNT client to submit data. This
will fix that.

Author: cmatthew

lnt/util/ServerUtil.py

@@ -10,7 +10,8 @@
 import urllib.error
 import contextlib
 import json
-
+import ssl
+import certifi
 import lnt.server.instance
 
 # FIXME: I used to maintain this file in such a way that it could be used
@@ -44,7 +45,8 @@ def submitFileToServer(url, file, select_machine=None, merge_run=None):
     headers = {'Accept': 'application/json'}
     data = urllib.parse.urlencode(values).encode(encoding='ascii')
     try:
-        response = urllib.request.urlopen(urllib.request.Request(url, data, headers=headers))
+        context = ssl.create_default_context(cafile=certifi.where())
+        response = urllib.request.urlopen(urllib.request.Request(url, data, headers=headers), context=context)
     except urllib.error.HTTPError as e:
         _show_json_error(e.read())
         return

setup.py

@@ -134,6 +134,7 @@
         "requests",
         "future",
         "lit==0.11.1",
+        "certifi"
     ],
 
     ext_modules=[cPerf],