xfail "docker top" tests, and adjust for alpine image

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

Author: thaJeztah

tests/integration/api_container_test.py

@@ -1102,6 +1102,8 @@ def test_port(self):
 
 
 class ContainerTopTest(BaseAPIIntegrationTest):
+    @pytest.mark.xfail(reason='Output of docker top depends on host distro, '
+                              'and is not formalized.')
     def test_top(self):
         container = self.client.create_container(
             TEST_IMG, ['sleep', '60']
@@ -1112,28 +1114,25 @@ def test_top(self):
         self.client.start(container)
         res = self.client.top(container)
         if not IS_WINDOWS_PLATFORM:
-            assert res['Titles'] == [
-                'UID', 'PID', 'PPID', 'C', 'STIME', 'TTY', 'TIME', 'CMD'
-            ]
+            assert res['Titles'] == [u'PID', u'USER', u'TIME', u'COMMAND']
         assert len(res['Processes']) == 1
         assert res['Processes'][0][-1] == 'sleep 60'
         self.client.kill(container)
 
     @pytest.mark.skipif(
         IS_WINDOWS_PLATFORM, reason='No psargs support on windows'
     )
+    @pytest.mark.xfail(reason='Output of docker top depends on host distro, '
+                              'and is not formalized.')
     def test_top_with_psargs(self):
         container = self.client.create_container(
             TEST_IMG, ['sleep', '60'])
 
         self.tmp_containers.append(container)
 
         self.client.start(container)
-        res = self.client.top(container, 'waux')
-        assert res['Titles'] == [
-            'USER', 'PID', '%CPU', '%MEM', 'VSZ', 'RSS',
-            'TTY', 'STAT', 'START', 'TIME', 'COMMAND'
-        ]
+        res = self.client.top(container, '-eopid,user')
+        assert res['Titles'] == [u'PID', u'USER']
         assert len(res['Processes']) == 1
         assert res['Processes'][0][10] == 'sleep 60'