Repull image when error

Docker pull command was enclosed to one keyword, in this keyword,
there're retry and log record.

Signed-off-by: Danfeng Liu (c) <danfengl@vmware.com>

tests/resources/Docker-Util.robot

@@ -28,7 +28,9 @@ Pull image
     ${image_with_tag}=  Set Variable If  '${tag}'=='${null}'  ${image}  ${image}:${tag}
     Run Keyword If  ${is_robot}==${false}  Wait Unitl Command Success  docker login -u ${user} -p ${pwd} ${ip}
     ...  ELSE  Wait Unitl Command Success  docker login -u robot\\\$${user} -p ${pwd} ${ip}
-    ${output}=  Wait Unitl Command Success  docker pull ${ip}/${project}/${image_with_tag}
+    ${output}=  Docker Pull  ${ip}/${project}/${image_with_tag}
+    Log  ${output}
+    Log To Console  ${output}
     Should Contain  ${output}  Digest:
     Should Contain  ${output}  Status:
     Should Not Contain  ${output}  No such image:
@@ -38,7 +40,7 @@ Push image
     ${image_with_sha256}=  Set Variable If  '${sha256}'=='${null}'  ${image}  ${image}@sha256:${sha256}
     ${image_with_tag}=  Set Variable If  '${sha256}'=='${null}'  ${image}  ${image}:${sha256}
     Log To Console  \nRunning docker push ${image}...
-    Wait Unitl Command Success  docker pull ${image_with_sha256}
+    Docker Pull  ${image_with_sha256}
     Run Keyword If  ${is_robot}==${false}  Wait Unitl Command Success  docker login -u ${user} -p ${pwd} ${ip}
     ...  ELSE  Wait Unitl Command Success  docker login -u robot\\\$${user} -p ${pwd} ${ip}
     Wait Unitl Command Success  docker tag ${image_with_sha256} ${ip}/${project}/${image_with_tag}
@@ -50,7 +52,7 @@ Push Image With Tag
 #tag1 is tag of image on docker hub,default latest,use a version existing if you do not want to use latest
     [Arguments]  ${ip}  ${user}  ${pwd}  ${project}  ${image}  ${tag}  ${tag1}=latest
     Log To Console  \nRunning docker push ${image}...
-    Wait Unitl Command Success  docker pull ${image}:${tag1}
+    Docker Pull  ${image}:${tag1}
     Wait Unitl Command Success  docker login -u ${user} -p ${pwd} ${ip}
     Wait Unitl Command Success  docker tag ${image}:${tag1} ${ip}/${project}/${image}:${tag}
     Wait Unitl Command Success  docker push ${ip}/${project}/${image}:${tag}
@@ -75,7 +77,7 @@ Cannot Pull Unsigned Image
 Cannot Push image
     [Arguments]  ${ip}  ${user}  ${pwd}  ${project}  ${image}  ${err_msg}=${null}
     Log To Console  \nRunning docker push ${image}...
-    Wait Unitl Command Success  docker pull ${image}
+    Docker Pull  ${image}
     Wait Unitl Command Success  docker login -u ${user} -p ${pwd} ${ip}
     Wait Unitl Command Success  docker tag ${image} ${ip}/${project}/${image}
     ${output}=  Command Should be Failed  docker push ${ip}/${project}/${image}
@@ -140,7 +142,10 @@ Docker Login
 
 Docker Pull
     [Arguments]  ${image}
-    Wait Unitl Command Success  docker pull ${image}
+    ${output}=  Retry Keyword When Error  Wait Unitl Command Success  docker pull ${image}
+    Log  ${output}
+    Log To Console  Docker Pull: \n ${output}
+    [Return]  ${output}
 
 Docker Tag
     [Arguments]  ${src_image}   ${dst_image}

tests/resources/Harbor-Util.robot

@@ -80,9 +80,7 @@ Switch To LDAP
     Config Harbor cfg  auth=ldap_auth  http_proxy=https
     Prepare
     Up Harbor
-    ${rc}=  Run And Return Rc  docker pull osixia/openldap:1.1.7
+    Docker Pull  osixia/openldap:1.1.7
-    Log  ${rc}
-    Should Be Equal As Integers  ${rc}  0
     ${rc}  ${output}=  Run And Return Rc And Output  cd tests && ./ldapprepare.sh
     Log  ${rc}
     Log  ${output}

tests/resources/TestCaseBody.robot

@@ -101,8 +101,7 @@ Body Of Admin Push Signed Image
     [Arguments]  ${image}=tomcat  ${with_remove}=${false}
     Enable Notary Client
 
-    ${rc}  ${output}=  Run And Return Rc And Output  docker pull hello-world:latest
+    Docker Pull  hello-world:latest
-    Log  ${output}
 
     Push image  ${ip}  ${HARBOR_ADMIN}  ${HARBOR_PASSWORD}  library  hello-world:latest
     ${rc}  ${output}=  Run And Return Rc And Output  ./tests/robot-cases/Group0-Util/notary-push-image.sh ${ip} library ${image} latest ${notaryServerEndpoint}

tests/resources/Util.robot

@@ -233,6 +233,7 @@ Retry Keyword When Error
     \    Sleep  2
     Run Keyword If  '${out[0]}'=='FAIL'  Capture Page Screenshot
     Should Be Equal As Strings  '${out[0]}'  'PASS'
+    [Return]  ${out[1]}
 
 Retry Keyword When Return Value Mismatch
     [Arguments]  ${keyword}  ${expected_value}  ${count}  @{elements}