Always use stream=True when iterating over a request

Fixes https://pagure.io/releng/issue/9226

koji/__init__.py

@@ -1677,7 +1677,7 @@ def openRemoteFile(relpath, topurl=None, topdir=None, tempdir=None):
         url = "%s/%s" % (topurl, relpath)
         fo = tempfile.TemporaryFile(dir=tempdir)
         try:
-            resp = requests.get(url)
+            resp = requests.get(url, stream=True)
             for chunk in resp.iter_content(chunk_size=8192):
                 fo.write(chunk)
         finally:

koji/tasks.py

@@ -479,7 +479,7 @@ class BaseTaskHandler(object):
             self.logger.debug("Downloading %s", relpath)
             url = "%s/%s" % (self.options.topurl, relpath)
             try:
-                resp = requests.get(url)
+                resp = requests.get(url, stream=True)
                 if not os.path.exists(os.path.dirname(fn)):
                     os.makedirs(os.path.dirname(fn))
                 with open(fn, 'wb') as fdst: