now get_url defaults to module temp dir (#36218)

* now get_url and other modules default to module temp dir

also fixed 'bare' exception

* allow modules to work with older versions

* updated docs per feedback

lib/ansible/modules/net_tools/basics/uri.py

@@ -241,7 +241,7 @@ JSON_CANDIDATES = ('text', 'json', 'javascript')
 
 def write_file(module, url, dest, content):
     # create a tempfile with some test content
-    fd, tmpsrc = tempfile.mkstemp()
+    fd, tmpsrc = tempfile.mkstemp(dir=getattr(module, 'tmpdir', None))
     f = open(tmpsrc, 'wb')
     try:
         f.write(content)