Fix pylint "W" missing-timeout warnings

After updating pylint, it started emitting additional "W"
warnings in some cases. Fix the missing-timeout ones by
adding a timeout=60 value to the calls done by the
metadata agent code.

Trivialfix

Change-Id: Ica5c2a2d3941813b3518b83738ada96bdf7c3760

.pylintrc

@@ -60,7 +60,6 @@ disable=
  arguments-renamed,
  broad-exception-raised,
  unspecified-encoding,
- missing-timeout,
  redundant-u-string-prefix,
  unused-private-member,
 # "C" Coding convention violations

neutron/agent/metadata/agent.py

@@ -256,7 +256,8 @@ class MetadataProxyHandler(object):
                                 headers=headers,
                                 data=req.body,
                                 cert=client_cert,
-                                verify=verify_cert)
+                                verify=verify_cert,
+                                timeout=60)
 
         if resp.status_code == 200:
             req.response.content_type = resp.headers['content-type']

neutron/agent/ovn/metadata/server.py

@@ -153,7 +153,8 @@ class MetadataProxyHandler(object):
                                 headers=headers,
                                 data=req.body,
                                 cert=client_cert,
-                                verify=verify_cert)
+                                verify=verify_cert,
+                                timeout=60)
 
         if resp.status_code == 200:
             req.response.content_type = resp.headers['content-type']

neutron/tests/unit/agent/metadata/test_agent.py

@@ -434,7 +434,8 @@ class _TestMetadataProxyHandlerCacheMixin(object):
                     data=body,
                     cert=(self.fake_conf.nova_client_cert,
                           self.fake_conf.nova_client_priv_key),
-                    verify=False)
+                    verify=False,
+                    timeout=60)
 
                 return retval
 

neutron/tests/unit/agent/ovn/metadata/test_server.py

@@ -167,7 +167,8 @@ class TestMetadataProxyHandler(base.BaseTestCase):
                     data=body,
                     cert=(self.fake_conf.nova_client_cert,
                           self.fake_conf.nova_client_priv_key),
-                    verify=False)
+                    verify=False,
+                    timeout=60)
 
                 return retval