[pipeline] Download swss common artifact in a separated directory (#995)

* Put the downloaded swss common artifact in a separated directory while build sairedis target.
* The downloaded swss common artifact is in a sub-directory of sairedis artifact, then it avoids
   overriding the previous swss common packages.

.azure-pipelines/build-template.yml

@@ -58,6 +58,9 @@ jobs:
     image: sonicdev-microsoft.azurecr.io:443/${{ parameters.sonic_slave }}:latest
 
   steps:
+  - checkout: self
+    clean: true
+    submodules: true
   - script: |
       sudo apt-get install -qq -y \
         qtbase5-dev \
@@ -98,14 +101,14 @@ jobs:
       artifact: ${{ parameters.swss_common_artifact_name }}
       runVersion: 'latestFromBranch'
       runBranch: 'refs/heads/master'
+      path: '$(Build.SourcesDirectory)/${{ parameters.swss_common_artifact_name }}'
     displayName: "Download sonic swss common deb packages"
   - script: |
+      cd $(Build.SourcesDirectory)/${{ parameters.swss_common_artifact_name }}
       sudo dpkg -i libswsscommon_1.0.0_${{ parameters.arch }}.deb
       sudo dpkg -i libswsscommon-dev_1.0.0_${{ parameters.arch }}.deb
     workingDirectory: $(Pipeline.Workspace)
     displayName: "Install sonic swss Common"
-  - checkout: self
-    submodules: true
   - script: |
       set -ex
       ./autogen.sh