Fixes to make script_load_keymap test pass.

Removed Armature Sketch keymap, as the entries that were there
appear to have been moved to the Armature keymap.
Removed the Script keymap. The Script space is deprecated
and I could find no way that the keymap could be activated.

release/scripts/modules/bpy_extras/keyconfig_utils.py

@@ -52,7 +52,6 @@ KM_HIERARCHY = [
         ('Image Paint', 'EMPTY', 'WINDOW', []),  # image and view3d
         ('Sculpt', 'EMPTY', 'WINDOW', []),
 
-        ('Armature Sketch', 'EMPTY', 'WINDOW', []),
         ('Particle', 'EMPTY', 'WINDOW', []),
 
         ('Knife Tool Modal Map', 'EMPTY', 'WINDOW', []),