patman: Move to absolute imports

At present patman sets the python path on startup so that it can access
the libraries it needs. If we convert to use absolute imports this is not
necessary.

Move patman to use absolute imports. This requires changes in tools which
use the patman libraries (which is most of them).

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/patman/tout.py b/tools/patman/tout.py
index ee3c519..c7e3272 100644
--- a/tools/patman/tout.py
+++ b/tools/patman/tout.py
@@ -6,7 +6,7 @@
 
 import sys
 
-import terminal
+from patman import terminal
 
 # Output verbosity levels that we support
 ERROR, WARNING, NOTICE, INFO, DETAIL, DEBUG = range(6)