avocado.utils: Small unused variable fixes

Signed-off-by: NLucas Meneghel Rodrigues <lmr@redhat.com>

avocado/utils/archive.py

@@ -248,7 +248,7 @@ def create_zip(name, path):
     if name.endswith('.zip') is False:
         name += '.zip'
     with zipfile.ZipFile(name, 'w') as zf:
-        for root, dirs, files in os.walk(path):
+        for root, _, files in os.walk(path):
             for f in files:
                 newroot = root.replace(path, '')
                 zf.write(os.path.join(root, f),

avocado/utils/virt.py

@@ -63,7 +63,7 @@ class Hypervisor(object):
         if self.connected is False:
             try:
                 self.connection = libvirt.open(self.uri)
-            except libvirt.libvirtError as err:
+            except libvirt.libvirtError:
                 self.connected = False
                 return None
             else: