Fix modelschema.schema_list()

  * Fix glob path, since :
    ipdb> print '{}/*/*/schemas/*.yaml'.format(_get_base_dir())
    /usr/share/salt-formulas/env/*/*/schemas/*.yaml
    Process empty list:
    ipdb> print schemas
    []

Change-Id: I6ad048cb601baea9282e3c2a30fb79fdddd1ee0b
diff --git a/_modules/modelschema.py b/_modules/modelschema.py
index 3a67bc9..cb45153 100644
--- a/_modules/modelschema.py
+++ b/_modules/modelschema.py
@@ -70,7 +70,7 @@
 
     """
     output = {}
-    schemas = glob.glob('{}/*/*/schemas/*.yaml'.format(_get_base_dir()))
+    schemas = glob.glob('{}/*/schemas/*.yaml'.format(_get_base_dir()))
     for schema in schemas:
         if os.path.exists(schema):
             role_name = schema.split('/')[-1].replace('.yaml', '')