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/entry_test.py

@@ -9,16 +9,16 @@
 import collections
 import unittest
 
-import entry
-
 class TestEntry(unittest.TestCase):
     def testEntryContents(self):
         """Test the Entry bass class"""
+        import entry
         base_entry = entry.Entry(None, None, None, read_node=False)
         self.assertEqual(True, base_entry.ObtainContents())
 
     def testUnknownEntry(self):
         """Test that unknown entry types are detected"""
+        import entry
         Node = collections.namedtuple('Node', ['name', 'path'])
         node = Node('invalid-name', 'invalid-path')
         with self.assertRaises(ValueError) as e: