add vms fixture that gets recorded using vcrpy

Should help prevent creating duplicate vcrpy yaml's in
onedns/tests/fixtures for the same 'get all vms' request in multiple
tests.

onedns/tests/conftest.py

@@ -1,6 +1,7 @@
 import pytest
 
 from onedns import resolver
+from onedns.tests import vcr
 from onedns.clients import one
 
 
@@ -23,3 +24,9 @@ def oneclient(request):
     NOTE: All fixtures must be function scope to work with VCRPY cassettes
     """
     return one.OneClient()
+
+
+@pytest.fixture(scope="function")
+@vcr.use_cassette()
+def vms(oneclient):
+    return oneclient.vms()

onedns/tests/test_oneclient.py

@@ -6,9 +6,7 @@ import oca
 from oca import vm
 
 
-@vcr.use_cassette()
-def test_get_vms(oneclient):
-    vms = oneclient.vms()
+def test_get_vms(vms):
     assert isinstance(vms, vm.VirtualMachinePool)
     assert len(vms) > 0