ci: Publish toolstate changes from Azure

This commit moves toolstate publishing from Travis to Azure. We've been
testing on azure for some time now and this works by deleting the Travis
config and updating the credentials used on Azure.

.azure-pipelines/master.yml

@@ -7,7 +7,7 @@ trigger:
   - master
 
 variables:
-- group: prod-credentials
+- group: real-prod-credentials
 
 pool:
   vmImage: ubuntu-16.04

.travis.yml

@@ -229,16 +229,6 @@ matrix:
       name: mingw-check
       if: type = pull_request OR branch = auto
 
-    - stage: publish toolstate
-      if: branch = master AND type = push
-      before_install: []
-      install: []
-      sudo: false
-      script:
-        MESSAGE_FILE=$(mktemp -t msg.XXXXXX);
-        . src/ci/docker/x86_64-gnu-tools/repo.sh;
-        commit_toolstate_change "$MESSAGE_FILE" "$TRAVIS_BUILD_DIR/src/tools/publish_toolstate.py" "$(git rev-parse HEAD)" "$(git log --format=%s -n1 HEAD)" "$MESSAGE_FILE" "$TOOLSTATE_REPO_ACCESS_TOKEN";
-
 before_install:
   # We'll use the AWS cli to download/upload cached docker layers as well as
   # push our deployments, so download that here.