binman: Move GetEntryModules() to control

When binman is installed its main program is in a different directory
to its modules. This means that __file__ is different and we cannot use
it to obtain the path to etype/ from main.py

To fix this, move the function to the 'control' module, since it is
installed with all the other modules, including the etype/ directory.

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

tools/binman/control.py

@@ -6,6 +6,7 @@
 #
 
 from collections import OrderedDict
+import glob
 import os
 import sys
 from patman import tools
@@ -51,6 +52,18 @@ def _FindBinmanNode(dtb):
             return node
     return None
 
+def GetEntryModules(include_testing=True):
+    """Get a set of entry class implementations
+
+    Returns:
+        Set of paths to entry class filenames
+    """
+    our_path = os.path.dirname(os.path.realpath(__file__))
+    glob_list = glob.glob(os.path.join(our_path, 'etype/*.py'))
+    return set([os.path.splitext(os.path.basename(item))[0]
+                for item in glob_list
+                if include_testing or '_testing' not in item])
+
 def WriteEntryDocs(modules, test_missing=None):
     """Write out documentation for all entries