create pySim.legacy.ts_51_011.py and move legacy code there

Those old flat dicts indicating FID to string-name mapping have long
been obsoleted by the pySim.filsystem based classes.

Change-Id: I20ceea3fdb02ee70d8c8889c078b2e5a0f17c83b
diff --git a/pySim-read.py b/pySim-read.py
index 52c60be..74bb35a 100755
--- a/pySim-read.py
+++ b/pySim-read.py
@@ -28,7 +28,8 @@
 import random
 import re
 import sys
-from pySim.ts_51_011 import EF, DF, EF_SST_map, EF_AD
+from pySim.ts_51_011 import EF_SST_map, EF_AD
+from pySim.legacy.ts_51_011 import EF, DF
 from pySim.ts_31_102 import EF_UST_map, EF_USIM_ADF_map
 from pySim.ts_31_103 import EF_IST_map, EF_ISIM_ADF_map