REPO-5271 Backport new structure to relaese/6.0.0 (#14)

- Simplify dependencies and standardise order
- README updated
- Green builds
- Changes to make Jars in enterprise war match
- Changes to make files in enterprise image match
- Added travis_wait 40 to the initial build as it can take 20 minutes to download artifacts
- Removed TAS tests from .travis.yml but not the code as TAS tests require Java 11 - Added in an empty test so the build runs on feature branches.

scripts/travis/trigger_travis.sh

@@ -0,0 +1,48 @@
+#!/usr/bin/env bash
+set -ev
+
+USER=${1}
+REPO=${2}
+BRANCH=${3}
+
+if [ "${TRAVIS_PULL_REQUEST}" != "false" ]; then
+  echo "Downstream projects shouldn't be triggered from PR builds"
+  exit 1
+fi
+
+if ! git ls-remote --exit-code --heads "https://${GIT_USERNAME}:${GIT_PASSWORD}@github.com/${USER}/${REPO}.git" "${BRANCH}" ; then
+  echo "Branch \"${BRANCH}\" not found on the downstream repository ${USER}/${REPO}. Exiting..."
+  exit 0
+fi
+
+
+URL="https://api.travis-ci.com/repo/${USER}%2F${REPO}/requests"
+BODY="{
+\"request\": {
+  \"branch\":\"${BRANCH}\"
+}}"
+
+printf "Travis API call:\n  URL: %s\n  Body: %s\n\n" "${URL}" "${BODY}"
+
+curl -s -X POST \
+  -H "Content-Type: application/json" \
+  -H "Accept: application/json" \
+  -H "Travis-API-Version: 3" \
+  -H "Authorization: token ${TRAVIS_ACCESS_TOKEN_TEMP}" \
+  -d "${BODY}" \
+  "${URL}" \
+ | tee /tmp/travis-request-output.txt
+
+cat /tmp/travis-request-output.txt
+
+if grep -q '"@type": "error"' /tmp/travis-request-output.txt; then
+  echo "Error when triggering build..."
+  exit 2
+fi
+if grep -q 'access denied' /tmp/travis-request-output.txt; then
+  echo "Access denied when triggering build..."
+  exit 3
+fi
+
+exit 0
+