Use custom agent pool for Ubuntu 18.04 builds (#283)

Author: mthalman

eng/pipelines/dotnet-buildtools-prereqs-eng.yml

@@ -17,5 +17,11 @@ stages:
   - template: ../common/templates/stages/build-test-publish-repo.yml
     parameters:
       linuxAmdBuildJobTimeout: 210
+      ${{ if eq(variables['System.TeamProject'], 'public') }}:
+        linuxAmdBuildPool: "NetCorePublic-Pool"
+        linuxAmdBuildQueue: "BuildPool.Ubuntu.1604.Amd64.Open"
+      ${{ if eq(variables['System.TeamProject'], 'internal') }}:
+        linuxAmdBuildPool: "NetCoreInternal-Pool"
+        linuxAmdBuildQueue: "BuildPool.Ubuntu.1604.Amd64"
       customBuildInitSteps:
       - template: /eng/pipelines/steps/install-cross-build-prereqs.yml

eng/pipelines/dotnet-buildtools-prereqs-ubuntu18.yml

@@ -22,5 +22,11 @@ stages:
   - template: ../common/templates/stages/build-test-publish-repo.yml
     parameters:
       linuxAmdBuildJobTimeout: 150
+      ${{ if eq(variables['System.TeamProject'], 'public') }}:
+        linuxAmdBuildPool: "NetCorePublic-Pool"
+        linuxAmdBuildQueue: "BuildPool.Ubuntu.1604.Amd64.Open"
+      ${{ if eq(variables['System.TeamProject'], 'internal') }}:
+        linuxAmdBuildPool: "NetCoreInternal-Pool"
+        linuxAmdBuildQueue: "BuildPool.Ubuntu.1604.Amd64"
       customBuildInitSteps:
       - template: /eng/pipelines/steps/install-cross-build-prereqs.yml