patman: Move code for sending into its own module

The control module includes much of the implementation of patman's
'send' feature. As a first step to separating this out, move the sending
code into its own file.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/patman/__main__.py b/tools/patman/__main__.py
index 1d1eaa1..4e20761 100755
--- a/tools/patman/__main__.py
+++ b/tools/patman/__main__.py
@@ -15,10 +15,10 @@
 sys.path.append(os.path.join(our_path, '..'))
 
 # Our modules
+from u_boot_pylib import test_util
 from u_boot_pylib import tout
 from patman import cmdline
 from patman import control
-from u_boot_pylib import test_util
 
 
 def run_patman():