use glob.escape() on the folder to allow paths with brackets []

entrypoint fails to find the files if they are under a path with square brackets as glob tries to interpret them and fails.
Using `glob.escape(folder)` fixes that.
See ipython/ipython#11512 for details

entrypoints.py

@@ -191,8 +191,8 @@ def iter_files_distros(path=None, repeated_distro='first'):
 
         # Regular file imports (not egg, not zip file)
         for path in itertools.chain(
-            glob.iglob(osp.join(folder, '*.dist-info', 'entry_points.txt')),
-            glob.iglob(osp.join(folder, '*.egg-info', 'entry_points.txt'))
+            glob.iglob(osp.join(glob.escape(folder), '*.dist-info', 'entry_points.txt')),
+            glob.iglob(osp.join(glob.escape(folder), '*.egg-info', 'entry_points.txt'))
         ):
             distro_name_version = osp.splitext(osp.basename(osp.dirname(path)))[0]
             distro = Distribution.from_name_version(distro_name_version)