[2252] remove exceptional cases when checking initial statistics of Xfrout

On my environment socket.unixdomain.open happened to count to 1
before, but now it no longer happen. If it happens in future again, we
need to investigate why it happens, and then fix a issue or add a
workaround.

tests/lettuce/features/xfrin_notify_handling.feature

@@ -27,11 +27,7 @@ Feature: Xfrin incoming notify handling
     #
     # Test1 for Xfrout statistics
     #
-    check initial statistics not containing example.org for Xfrout with cmdctl port 47804 except for the following items
-      | item_name                | min_value | max_value |
-      | socket.unixdomain.open   |         0 |         1 |
-    # Note: Sometime an unixdomain socket could be already opened at
-    # the first time when stats daemon queries xfrout statistics.
+    check initial statistics not containing example.org for Xfrout with cmdctl port 47804
 
     #
     # Test2 for Xfrin statistics
@@ -127,11 +123,7 @@ Feature: Xfrin incoming notify handling
     #
     # Test1 for Xfrout statistics
     #
-    check initial statistics not containing example.org for Xfrout with cmdctl port 47804 except for the following items
-      | item_name                | min_value | max_value |
-      | socket.unixdomain.open   |         0 |         1 |
-    # Note: Sometime an unixdomain socket could be already opened at
-    # the first time when stats daemon queries xfrout statistics.
+    check initial statistics not containing example.org for Xfrout with cmdctl port 47804
     #
     # Test2 for Xfrin statistics
     #
@@ -234,11 +226,7 @@ Feature: Xfrin incoming notify handling
     #
     # Test1 for Xfrout statistics
     #
-    check initial statistics not containing example.org for Xfrout with cmdctl port 47804 except for the following items
-      | item_name                | min_value | max_value |
-      | socket.unixdomain.open   |         0 |         1 |
-    # Note: Sometime an unixdomain socket could be already opened at
-    # the first time when stats daemon queries xfrout statistics.
+    check initial statistics not containing example.org for Xfrout with cmdctl port 47804
 
     #
     # Test2 for Xfrin statistics
@@ -346,11 +334,7 @@ Feature: Xfrin incoming notify handling
     #
     # Test1 for Xfrout statistics
     #
-    check initial statistics not containing example.org for Xfrout with cmdctl port 47804 except for the following items
-      | item_name                | min_value | max_value |
-      | socket.unixdomain.open   |         0 |         1 |
-    # Note: Sometime an unixdomain socket could be already opened at
-    # the first time when stats daemon queries xfrout statistics.
+    check initial statistics not containing example.org for Xfrout with cmdctl port 47804
 
     #
     # Test2 for Xfrin statistics