pr-head, pr-merge: Checkout from the official repo

Checkout codes and ci script from the official repositories

Signed-off-by: Arthur She <arthur.she@linaro.org>
Change-Id: If3b15e767247aa458ea699804265ecff74c293e9
diff --git a/mbed-tls-pr-merge.yaml b/mbed-tls-pr-merge.yaml
index f3fd0d5..8251beb 100644
--- a/mbed-tls-pr-merge.yaml
+++ b/mbed-tls-pr-merge.yaml
@@ -15,15 +15,12 @@
                   <name>mbedtls-test</name>
                   <retriever class="org.jenkinsci.plugins.workflow.libs.SCMSourceRetriever">
                     <scm class="org.jenkinsci.plugins.github_branch_source.GitHubSCMSource" plugin="github-branch-source@2.9.1">
-                      <id>640a3c19-54ab-467e-8381-a2ef9f3896f4</id>
-                      <apiUri>https://api.github.com</apiUri>
-                      <credentialsId>mbedtls-test-github-token</credentialsId>
-                      <repoOwner>lsandov1</repoOwner>
+                      <repoOwner>ARMmbed</repoOwner>
                       <repository>mbedtls-test</repository>
-                      <repositoryUrl>https://github.com/lsandov1/mbedtls-test</repositoryUrl>
+                      <repositoryUrl>https://github.com/ARMmbed/mbedtls-test.git</repositoryUrl>
                     </scm>
                   </retriever>
-                  <defaultVersion>mbedtls-open-ci</defaultVersion>
+                  <defaultVersion>master</defaultVersion>
                   <implicit>true</implicit>
                   <allowVersionOverride>true</allowVersionOverride>
                   <includeInChangesets>true</includeInChangesets>
@@ -34,9 +31,9 @@
     - github:
         api-uri: https://api.github.com
         credentials-id: mbedtls-github-token
-        repo-owner: lsandov1
+        repo-owner: ARMmbed
         repo: mbedtls
-        repository-url: https://github.com/lsandov1/mbedtls.git
+        repository-url: https://github.com/ARMmbed/mbedtls.git
         branch-discovery: no-pr
         discover-pr-forks-strategy: both
         discover-pr-forks-trust: permission