Replace use of os.errno.* with errno.*

According to the following, os.errno has been removed in Py3.7:
https://bugs.python.org/msg317876

Change-Id: I941ba24a5f4ede4cc596dca92946ff5ae88a1d53
Closes-Bug: #1782204

2 files changed, 4 insertions, 2 deletions

diff --git a/designate/backend/agent_backend/impl_djbdns.py b/designate/backend/agent_backend/impl_djbdns.py
index dccdfdac..393ce920 100755
--- a/designate/backend/agent_backend/impl_djbdns.py
+++ b/designate/backend/agent_backend/impl_djbdns.py
@@ -38,6 +38,7 @@ Requires rootwrap (or equivalent sudo privileges) to execute:
 
 """
 
+import errno
 import glob
 import os
 import random
@@ -349,7 +350,7 @@ class DjbdnsBackend(base.AgentBackend):
             os.remove(zone_fn)
             LOG.debug('Deleted Zone: %s', zone_name)
         except OSError as e:
-            if os.errno.ENOENT == e.errno:
+            if errno.ENOENT == e.errno:
                 LOG.info("Zone datafile %s was already deleted", zone_fn)
                 return
 
diff --git a/designate/backend/agent_backend/impl_gdnsd.py b/designate/backend/agent_backend/impl_gdnsd.py
index acaa84be..4df8ab86 100644
--- a/designate/backend/agent_backend/impl_gdnsd.py
+++ b/designate/backend/agent_backend/impl_gdnsd.py
@@ -38,6 +38,7 @@ Supported Knot versions: >= 2.1, < 3
 Configured in [service:agent:gdnsd]
 """
 
+import errno
 import os
 import tempfile
 import string
@@ -245,7 +246,7 @@ class GdnsdBackend(base.AgentBackend):
             os.remove(zone_fn)
             LOG.debug('Deleted Zone: %s', zone_name)
         except OSError as e:
-            if os.errno.ENOENT == e.errno:
+            if errno.ENOENT == e.errno:
                 LOG.info("Zone datafile %s was already deleted", zone_fn)
                 return
             raise