Fix pylint R1716 (chained-comparison) refactor messages

Use "a < b < c" instead of "a < b and b < c".

Change-Id: I1f0c46a609c56ffe869486b25fe6e82faaf3d5fb

.pylintrc

@@ -87,7 +87,6 @@ disable=
  too-many-return-statements,
  too-many-statements,
 # new for python3 version of pylint
- chained-comparison,
  consider-using-dict-comprehension,
  consider-using-set-comprehension,
  unnecessary-pass,

neutron/extensions/securitygroup.py

@@ -153,7 +153,7 @@ def convert_protocol(value):
         return
     try:
         val = int(value)
-        if val >= 0 and val <= 255:
+        if 0 <= val <= 255:
             # Set value of protocol number to string due to bug 1381379,
             # PostgreSQL fails when it tries to compare integer with string,
             # that exists in db.

neutron/plugins/ml2/drivers/mech_sriov/agent/eswitch_manager.py

@@ -192,7 +192,7 @@ class EmbSwitch(object):
         # convert the rate_kbps value from kbps to Mbps.
         # Zero means to disable the rate so the lowest rate available is 1Mbps.
         # Floating numbers are not allowed
-        if rate_kbps > 0 and rate_kbps < 1000:
+        if 0 < rate_kbps < 1000:
             rate_mbps = 1
         else:
             rate_mbps = helpers.round_val(rate_kbps / 1000.0)