binman: Set up 'entry' to permit full test coverage

There is a little check at the top of entry.py which decides if importlib
is available. At present this has no test coverage. To add this we will
need to import the module twice, once with importlib and once without.
In preparation for allowing a test to control the importing of this
module, remove all global imports of the 'entry' module.

Signed-off-by: Simon Glass <sjg@chromium.org>

tools/binman/image.py

@@ -9,8 +9,6 @@
 from collections import OrderedDict
 from operator import attrgetter
 
-import entry
-from entry import Entry
 import fdt_util
 import tools
 
@@ -48,6 +46,11 @@ class Image:
         _entries: OrderedDict() of entries
     """
     def __init__(self, name, node):
+        global entry
+        global Entry
+        import entry
+        from entry import Entry
+
         self._node = node
         self._name = name
         self._size = None