Always define the session adapter

This represents no change of behaviour, but it enables us to set more
options to the adapter.

Signed-off-by: Amador Pahim <apahim@redhat.com>

github/Requester.py

@@ -90,11 +90,15 @@ class HTTPSRequestsConnectionClass:
         self.timeout = timeout
         self.verify = kwargs.get("verify", True)
         self.session = requests.Session()
-        # Code to support retries
-        if retry:
+
+        if retry is None:
+            self.retry = requests.adapters.DEFAULT_RETRIES
+        else:
             self.retry = retry
-            self.adapter = requests.adapters.HTTPAdapter(max_retries=self.retry)
-            self.session.mount("https://", self.adapter)
+        self.adapter = requests.adapters.HTTPAdapter(
+            max_retries=self.retry,
+        )
+        self.session.mount("https://", self.adapter)
 
     def request(self, verb, url, input, headers):
         self.verb = verb
@@ -130,11 +134,15 @@ class HTTPRequestsConnectionClass:
         self.timeout = timeout
         self.verify = kwargs.get("verify", True)
         self.session = requests.Session()
-        # Code to support retries
-        if retry:
+
+        if retry is None:
+            self.retry = requests.adapters.DEFAULT_RETRIES
+        else:
             self.retry = retry
-            self.adapter = requests.adapters.HTTPAdapter(max_retries=self.retry)
-            self.session.mount("http://", self.adapter)
+        self.adapter = requests.adapters.HTTPAdapter(
+            max_retries=self.retry,
+        )
+        self.session.mount("http://", self.adapter)
 
     def request(self, verb, url, input, headers):
         self.verb = verb

tests/Retry.py

@@ -75,3 +75,14 @@ class Retry(Framework.TestCase):
         self.assertEqual(len(httpretty.latest_requests), 4)
         for request in httpretty.latest_requests:
             self.assertEqual(request.path, "/repos/PyGithub/PyGithub")
+
+    def testReturnsRepoAfterSettingRetryHttp(self):
+        g = github.Github(
+            self.login,
+            self.password,
+            base_url="http://my.enterprise.com",
+            retry=0,
+        )  # http here
+        repository = g.get_repo(REPO_NAME)
+        self.assertIsInstance(repository, github.Repository.Repository)
+        self.assertEqual(repository.full_name, REPO_NAME)