Fix pep8 errors

Recent pep8 upgrade and corresponding pycodestyle update break
pep8 job due to the new rules.

This commit fixes the following new errors:
- E266 too many leading '#' for block comment
- E501 line too long
- H903  Windows style line endings not allowed in code

The following errors are added to the ignore list
as there are many errors:
- E402 module level import not at top of file
- E731 do not assign a lambda expression, use a def
- W503 line break before binary operator

Conflicts:
        neutron/tests/unit/plugins/ml2/drivers/linuxbridge/agent/test_linuxbridge_neutron_agent.py

Change-Id: I1fd3357479bb2ba3d89de92739ffac99900761b6
(cherry picked from commit 7a714aeb13)

neutron/plugins/ml2/drivers/openvswitch/agent/common/constants.py

@@ -35,9 +35,9 @@ NONEXISTENT_PEER = 'nonexistent-peer'
 TUNNEL_NETWORK_TYPES = [p_const.TYPE_GRE, p_const.TYPE_VXLAN,
                         p_const.TYPE_GENEVE]
 
-### OpenFlow table IDs
+# --- OpenFlow table IDs
 
-## Integration bridge (int_br)
+# --- Integration bridge (int_br)
 
 LOCAL_SWITCHING = 0
 
@@ -76,7 +76,7 @@ ACCEPTED_EGRESS_TRAFFIC_TABLE = 91
 ACCEPTED_INGRESS_TRAFFIC_TABLE = 92
 DROPPED_TRAFFIC_TABLE = 93
 
-## Tunnel bridge (tun_br)
+# --- Tunnel bridge (tun_br)
 
 # Various tables for tunneling flows
 DVR_PROCESS = 1
@@ -91,14 +91,14 @@ UCAST_TO_TUN = 20
 ARP_RESPONDER = 21
 FLOOD_TO_TUN = 22
 
-## Physical Bridges (phys_brs)
+# --- Physical Bridges (phys_brs)
 
 # Various tables for DVR use of physical bridge flows
 DVR_PROCESS_VLAN = 1
 LOCAL_VLAN_TRANSLATION = 2
 DVR_NOT_LEARN_VLAN = 3
 
-### end of OpenFlow table IDs
+# --- end of OpenFlow table IDs
 
 # type for ARP reply in ARP header
 ARP_REPLY = '0x2'

tox.ini

@@ -140,7 +140,11 @@ commands = sphinx-build -W -b linkcheck doc/source doc/build/linkcheck
 # TODO(ihrachys) figure out what to do with N534 and N536
 # N534 Untranslated exception message
 # N536 Use assertIsNone rather than assertEqual to check for None values
-ignore = E125,E126,E128,E129,E265,H404,H405,N530,N534,N536
+# TODO(amotoki) check the following new rules should be fixed or ignored
+# E402 module level import not at top of file
+# E731 do not assign a lambda expression, use a def
+# W503 line break before binary operator
+ignore = E125,E126,E128,E129,E265,E402,E731,W503,H404,H405,N530,N534,N536
 # H106: Don't put vim configuration in source files
 # H203: Use assertIs(Not)None to check for None
 # H904: Delay string interpolations at logging calls