buildman: Extract environment as part of each build

As we're building the boards, extract the default U-Boot environment to
uboot.env so we can interrogate it later.

Signed-off-by: Alex Kiernan <alex.kiernan@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/buildman/func_test.py b/tools/buildman/func_test.py
index 9206fb2..363db9d 100644
--- a/tools/buildman/func_test.py
+++ b/tools/buildman/func_test.py
@@ -327,6 +327,9 @@
     def _HandleCommandObjdump(self, args):
         return command.CommandResult(return_code=0)
 
+    def _HandleCommandObjcopy(self, args):
+        return command.CommandResult(return_code=0)
+
     def _HandleCommandSize(self, args):
         return command.CommandResult(return_code=0)
 
@@ -359,6 +362,8 @@
             return self._HandleCommandNm(args)
         elif cmd.endswith('objdump'):
             return self._HandleCommandObjdump(args)
+        elif cmd.endswith('objcopy'):
+            return self._HandleCommandObjcopy(args)
         elif cmd.endswith( 'size'):
             return self._HandleCommandSize(args)