Open temp file only once

mkstemp() returns a tuple containing an OS-level handle to an open file
(as would be returned by os.open()) and the absolute pathname of that
file, in that order.

This patch makes sure that the fd opened by tempfile.mkstemp() is
re-used and closed properly.

lib/ansible/modules/web_infrastructure/jenkins_plugin.py

@@ -575,19 +575,10 @@ class JenkinsPlugin(object):
 
             # Write the updates file
             update_fd, updates_file = tempfile.mkstemp()
+            os.write(update_fd, r.read())
 
             try:
-                fd = open(updates_file, 'wb')
-            except IOError:
-                e = get_exception()
-                self.module.fail_json(
-                    msg="Cannot open the tmp updates file %s." % updates_file,
-                    details=str(e))
-
-            fd.write(r.read())
-
-            try:
-                fd.close()
+                os.close(update_fd)
             except IOError:
                 e = get_exception()
                 self.module.fail_json(
@@ -651,25 +642,15 @@ class JenkinsPlugin(object):
 
     def _write_file(self, f, data):
         # Store the plugin into a temp file and then move it
-        tmp_f_tuple, tmp_f = tempfile.mkstemp()
-
-        try:
-            fd = open(tmp_f, 'wb')
-        except IOError:
-            e = get_exception()
-            self.module.fail_json(
-                msg='Cannot open the temporal plugin file %s.' % tmp_f,
-                details=str(e))
+        tmp_f_fd, tmp_f = tempfile.mkstemp()
 
         if isinstance(data, str):
-            d = data
+            os.write(tmp_f_fd, data)
         else:
-            d = data.read()
-
-        fd.write(d)
+            os.write(tmp_f_fd, data.read())
 
         try:
-            fd.close()
+            os.close(tmp_f_fd)
         except IOError:
             e = get_exception()
             self.module.fail_json(