Improve the display of pipeline. (#13125)

The display of azure pipeline is not specific now, such as when the step Run test fails, the display of itself shows successful, but the display of step Kvmdump shows fails, but actually, the step Kvmdump doesn't fail. I improve the display of azure pipeline in this pr, each step has its own success or failure, and is shown in azure pipeline.

Why I did it
The display of azure pipeline is not specific now, such as when the step Run test fails, the display of itself shows successful, but the display of step Kvmdump shows fails, but actually, the step Kvmdump doesn't fail. I improve the display of azure pipeline in this pr, each step has its own success or failure, and is shown in azure pipeline.

How I did it
Each step has its own signature of success or failure.
Using the chain of responsibility pattern to manage all status.
Modify the expected-state in each step.

Author: yutongzhang-microsoft

.azure-pipelines/run-test-scheduler-template.yml

@@ -76,7 +76,7 @@ steps:
       echo "TestbedV2 is just online and might not be stable enough, for any issue, please send email to [email protected]"
       echo "Runtime detailed progress at https://www.testbed-tools.org/scheduler/testplan/$TEST_PLAN_ID"
       # When "LOCK_TESTBED" finish, it changes into "PREPARE_TESTBED"
-      python ./.azure-pipelines/test_plan.py poll -i "$(TEST_PLAN_ID)" --expected-states PREPARE_TESTBED EXECUTING KVMDUMP FINISHED CANCELLED FAILED
+      python ./.azure-pipelines/test_plan.py poll -i "$(TEST_PLAN_ID)" --expected-state LOCK_TESTBED
     env:
       TESTBED_TOOLS_URL: $(TESTBED_TOOLS_URL)
     displayName: Lock testbed
@@ -89,7 +89,7 @@ steps:
       echo "TestbedV2 is just online and might not be stable enough, for any issue, please send email to [email protected]"
       echo "Runtime detailed progress at https://www.testbed-tools.org/scheduler/testplan/$TEST_PLAN_ID"
       # When "PREPARE_TESTBED" finish, it changes into "EXECUTING"
-      python ./.azure-pipelines/test_plan.py poll -i "$(TEST_PLAN_ID)" --expected-states EXECUTING KVMDUMP FINISHED CANCELLED FAILED
+      python ./.azure-pipelines/test_plan.py poll -i "$(TEST_PLAN_ID)" --expected-state PREPARE_TESTBED
     env:
       TESTBED_TOOLS_URL: $(TESTBED_TOOLS_URL)
     displayName: Prepare testbed
@@ -100,7 +100,7 @@ steps:
       echo "TestbedV2 is just online and might not be stable enough, for any issue, please send email to [email protected]"
       echo "Runtime detailed progress at https://www.testbed-tools.org/scheduler/testplan/$TEST_PLAN_ID"
       # When "EXECUTING" finish, it changes into "KVMDUMP", "FAILED", "CANCELLED" or "FINISHED"
-      python ./.azure-pipelines/test_plan.py poll -i "$(TEST_PLAN_ID)" --expected-states KVMDUMP FINISHED CANCELLED FAILED
+      python ./.azure-pipelines/test_plan.py poll -i "$(TEST_PLAN_ID)" --expected-state EXECUTING
     env:
       TESTBED_TOOLS_URL: $(TESTBED_TOOLS_URL)
     displayName: Run test
@@ -111,7 +111,7 @@ steps:
       echo "TestbedV2 is just online and might not be stable enough, for any issue, please send email to [email protected]"
       echo "Runtime detailed progress at https://www.testbed-tools.org/scheduler/testplan/$TEST_PLAN_ID"
       # When "KVMDUMP" finish, it changes into "FAILED", "CANCELLED" or "FINISHED"
-      python ./.azure-pipelines/test_plan.py poll -i "$(TEST_PLAN_ID)" --expected-states FINISHED CANCELLED FAILED
+      python ./.azure-pipelines/test_plan.py poll -i "$(TEST_PLAN_ID)" --expected-state KVMDUMP
     condition: succeededOrFailed()
     env:
       TESTBED_TOOLS_URL: $(TESTBED_TOOLS_URL)