Add sleep time to wait DCH docker daemon run (#2336)

In our testing, we sometime hit DCH docker daemon not running in our check point.
We add some sleep to wait it run.
In order not to miss critical issue, we only try at most 5 times with 3s
as intervals.

tests/test-cases/Group5-DCH/5-01-DCH.robot

@@ -37,7 +37,12 @@ Verify non-tls is enabled for dch-photon
     Should Be Equal As Integers  ${rc}  0
     Should Contain  ${output}  /dinv
     # verify 12375 could be accessed without any certs to show docker info
-    ${rc}  ${output}=  Run And Return Rc And Output  ${DEFAULT_LOCAL_DOCKER} -H ${VCH-IP}:12375 info
+    :FOR  ${IDX}  IN RANGE  5
+    \   ${rc}  ${output}=  Run And Return Rc And Output  ${DEFAULT_LOCAL_DOCKER} -H ${VCH-IP}:12375 info 
+    \   Log  ${output}
+    \   ${status}=  Run Keyword and Return Status  Should Not Contain  ${output}  'Is the docker daemon running'
+    \   Exit For Loop If  ${status} == True
+    \   Sleep  3s 
     Should Be Equal As Integers  ${rc}  0
     Should Contain  ${output}  Containers
 
@@ -51,7 +56,12 @@ Verify tls enabled scenario for dch-photon
     Should Be Equal As Integers  ${rc}  0
     Should Contain  ${output}  -tls
     # verify 12376 could be accessed with --tls to show docker info
-    ${rc}  ${output}=  Run And Return Rc And Output  ${DEFAULT_LOCAL_DOCKER} -H ${VCH-IP}:12376 --tls info
+    :FOR  ${IDX}  IN RANGE  5
+    \   ${rc}  ${output}=  Run And Return Rc And Output  ${DEFAULT_LOCAL_DOCKER} -H ${VCH-IP}:12376 --tls info
+    \   Log  ${output}
+    \   ${status}=  Run Keyword and Return Status  Should Not Contain  ${output}  'Is the docker daemon running'
+    \   Exit For Loop If  ${status} == True
+    \   Sleep  3s 
     Should Be Equal As Integers  ${rc}  0
     Should Contain  ${output}  Containers
 
@@ -65,8 +75,12 @@ Verify tlsverify enabled scenario for dch-photon
     Should Be Equal As Integers  ${rc}  0
     Should Contain  ${output}  -tlsverify
     # verify 12386 could not be accessed with --tls due to missing certs
-    ${rc}  ${output}=  Run And Return Rc And Output  ${DEFAULT_LOCAL_DOCKER} -H ${VCH-IP}:12386 --tls info
-    Log  ${output}
+    :FOR  ${IDX}  IN RANGE  5
+    \   ${rc}  ${output}=  Run And Return Rc And Output  ${DEFAULT_LOCAL_DOCKER} -H ${VCH-IP}:12386 --tls info
+    \   Log  ${output}
+    \   ${status}=  Run Keyword and Return Status  Should Not Contain  ${output}  'Is the docker daemon running'
+    \   Exit For Loop If  ${status} == True
+    \   Sleep  3s 
     Should Be Equal As Integers  ${rc}  1
     Should Contain  ${output}  --tlsverify
 
@@ -111,8 +125,12 @@ Verify local enabled scenario for dch-photon
     ${rc}=  Run command and Return output  ${DEFAULT_LOCAL_DOCKER} ${VCH-PARAMS} run -d -p 12389:2376 ${harbor-image-tagged} -tls -local
 
     # Verify 12389 could not be accessed with -local due to dockerd only monitors local unix socket
-    ${rc}  ${output}=  Run And Return Rc And Output  ${DEFAULT_LOCAL_DOCKER} -H ${VCH-IP}:12389 --tls ps
-    Log  ${output}
+    :FOR  ${IDX}  IN RANGE  5
+    \   ${rc}  ${output}=  Run And Return Rc And Output  ${DEFAULT_LOCAL_DOCKER} -H ${VCH-IP}:12389 --tls ps
+    \   Log  ${output}
+    \   ${status}=  Run Keyword and Return Status  Should Not Contain  ${output}  'Is the docker daemon running'
+    \   Exit For Loop If  ${status} == True
+    \   Sleep  3s 
     Should Be Equal As Integers  ${rc}  1
     Should Contain  ${output}  Cannot connect to the Docker daemon at tcp://${VCH-IP}:12389