Remove dependency on memory heavy python-requests.

It turns out that Neutron uses python-requests on just one place
and for no good reason. Given that loading Requests amount for 80MB
of RAM in my system, maybe it's worth removing our dependency on
requests.

Change-Id: I905252a55bd174ff1aa8bdec42fe32432746846f

neutron/agent/l3/keepalived_state_change.py

@@ -20,7 +20,6 @@ import httplib2
 import netaddr
 from oslo_config import cfg
 from oslo_log import log as logging
-import requests
 
 from neutron._i18n import _, _LE
 from neutron.agent.l3 import ha
@@ -105,7 +104,7 @@ class MonitorDaemon(daemon.Daemon):
                      'X-Neutron-State': state},
             connection_type=KeepalivedUnixDomainConnection)
 
-        if resp.status != requests.codes.ok:
+        if resp.status != 200:
             raise Exception(_('Unexpected response: %s') % resp)
 
         LOG.debug('Notified agent router %s, state %s', self.router_id, state)

requirements.txt

@@ -11,7 +11,6 @@ debtcollector>=1.2.0 # Apache-2.0
 eventlet!=0.18.3,>=0.18.2 # MIT
 pecan!=1.0.2,!=1.0.3,!=1.0.4,!=1.2,>=1.0.0 # BSD
 httplib2>=0.7.5 # MIT
-requests!=2.12.2,>=2.10.0 # Apache-2.0
 Jinja2!=2.9.0,!=2.9.1,!=2.9.2,!=2.9.3,!=2.9.4,>=2.8 # BSD License (3 clause)
 keystonemiddleware>=4.12.0 # Apache-2.0
 netaddr!=0.7.16,>=0.7.13 # BSD