[ci] Update azp reference to support transfering organization from Azure to sonic-net (#11605)

Why I did it
When transfer repo to another organization, azp reference also need change.
Change azp reference to avoid pipeline failure.

.azure-pipelines/azure-pipelines-UpgrateVersion.yml

@@ -18,9 +18,9 @@ resources:
   repositories:
   - repository: buildimage
     type: github
-    name: Azure/sonic-buildimage
+    name: sonic-net/sonic-buildimage
     ref: master
-    endpoint: build
+    endpoint: sonic-net
 
 pool: sonicbld
 

.azure-pipelines/build-commonlib.yml

@@ -11,9 +11,9 @@ resources:
   repositories:
   - repository: buildimage
     type: github
-    name: Azure/sonic-buildimage
+    name: sonic-net/sonic-buildimage
     ref: master
-    endpoint: build
+    endpoint: sonic-net
 
 jobs:
 - template: .azure-pipelines/template-commonlib.yml@buildimage

.azure-pipelines/docker-sonic-slave-template.yml

@@ -7,9 +7,9 @@ resources:
   repositories:
   - repository: buildimage
     type: github
-    name: Azure/sonic-buildimage
+    name: sonic-net/sonic-buildimage
     ref: master
-    endpoint: build
+    endpoint: sonic-net
 
 parameters:
 - name: arch

.azure-pipelines/official-build.yml

@@ -16,9 +16,9 @@ resources:
   repositories:
   - repository: buildimage
     type: github
-    name: Azure/sonic-buildimage
+    name: sonic-net/sonic-buildimage
     ref: master
-    endpoint: build
+    endpoint: sonic-net
 
 trigger: none
 pr: none

azure-pipelines.yml

@@ -32,8 +32,8 @@ resources:
     ref: refs/heads/202012
   - repository: buildimage
     type: github
-    name: Azure/sonic-buildimage
+    name: sonic-net/sonic-buildimage
-    endpoint: build
+    endpoint: sonic-net
     ref: master
 
 variables: