support to use python docker 3.5.0 (sonic-net#585)

* support to use python docker 3.5.0

start from docker 3.0.0, results from exec_run changed to
dict(outout, code)

Signed-off-by: Guohan Lu <gulv@microsoft.com>

* limit the scope of exception

Signed-off-by: Guohan Lu <gulv@microsoft.com>

* modify runcmd output to include exitcode

Signed-off-by: Guohan Lu <gulv@microsoft.com>

Author: lguohan

tests/README.md

@@ -8,7 +8,7 @@ SWSS Integration tests runs on docker-sonic-vs which runs on top of SAI virtual
 
 - Install docker and pytest on your dev machine
     ```
-    sudo pip install --system docker==2.6.1
+    sudo pip install --system docker==3.5.0
     sudo pip install --system pytest==3.3.0
     ```
 - Compile and install swss common library. Follow instructions [here](https://github.com/Azure/sonic-swss-common/blob/master/README.md) to first install prerequisites to build swss common library. 

tests/conftest.py

@@ -172,7 +172,11 @@ def check_ready(self, timeout=30):
         started = 0
         while True:
             # get process status
-            out = self.ctn.exec_run("supervisorctl status")
+            res = self.ctn.exec_run("supervisorctl status")
+            try:
+                out = res.output
+            except AttributeError:
+                out = res
             for l in out.split('\n'):
                 fds = re_space.split(l)
                 if len(fds) < 2:
@@ -204,7 +208,14 @@ def init_asicdb_validator(self):
         self.asicdb = AsicDbValidator(self)
 
     def runcmd(self, cmd):
-        return self.ctn.exec_run(cmd)
+        res = self.ctn.exec_run(cmd)
+        try:
+            exitcode = res.exit_code
+            out = res.output
+        except AttributeError:
+            exitcode = 0
+            out = res
+        return (exitcode, out)
 
 @pytest.yield_fixture(scope="module")
 def dvs(request):

tests/test_warm_reboot.py

@@ -169,7 +169,7 @@ def test_VlanMgrdWarmRestart(dvs):
     assert status == True
 
 
-    bv_before = dvs.runcmd("bridge vlan")
+    (exitcode, bv_before) = dvs.runcmd("bridge vlan")
     print(bv_before)
 
     restart_count = swss_get_RestartCount(state_db)
@@ -178,15 +178,15 @@ def test_VlanMgrdWarmRestart(dvs):
     dvs.runcmd(['sh', '-c', 'supervisorctl start vlanmgrd'])
     time.sleep(2)
 
-    bv_after = dvs.runcmd("bridge vlan")
+    (exitcode, bv_after) = dvs.runcmd("bridge vlan")
     assert bv_after == bv_before
 
      # No create/set/remove operations should be passed down to syncd for vlanmgr warm restart
-    num = dvs.runcmd(['sh', '-c', 'grep \|c\| /var/log/swss/sairedis.rec | wc -l'])
+    (exitcode, num) = dvs.runcmd(['sh', '-c', 'grep \|c\| /var/log/swss/sairedis.rec | wc -l'])
     assert num == '0\n'
-    num = dvs.runcmd(['sh', '-c', 'grep \|s\| /var/log/swss/sairedis.rec | wc -l'])
+    (exitcode, num) = dvs.runcmd(['sh', '-c', 'grep \|s\| /var/log/swss/sairedis.rec | wc -l'])
     assert num == '0\n'
-    num = dvs.runcmd(['sh', '-c', 'grep \|r\| /var/log/swss/sairedis.rec | wc -l'])
+    (exitcode, num) = dvs.runcmd(['sh', '-c', 'grep \|r\| /var/log/swss/sairedis.rec | wc -l'])
     assert num == '0\n'
 
     #new ip on server 5