Replace "sanity" with "validity"

Replaced the word "sanity" with the inclusive word "validity". The
comment in acs_survey_interference_factor() was referring a function
that does not exist, so remove it instead of trying rename the function.

Signed-off-by: Arowa Suliman <arowa@chromium.org>

tests/hwsim/test_fst_config.py

@@ -272,7 +272,7 @@ def parse_ies(iehex, el=-1):
     iel = [iehex[i:i + 2] for i in range(0, len(iehex), 2)]
     for i in range(0, len(iel)):
          iel[i] = int(iel[i], 16)
-    # Sanity check
+    # Validity check
     i = 0
     res = []
     while i < len(iel):

tests/hwsim/test_wmediumd.py

@@ -1,4 +1,4 @@
-# wmediumd sanity checks
+# wmediumd validity checks
 # Copyright (c) 2015, Intel Deutschland GmbH
 #
 # This software may be distributed under the terms of the BSD license.