Revert "ACS-2608 Support force directive. (#992)"

This reverts commit 905e813aa4.

.travis.yml

@@ -32,7 +32,7 @@ env:
 
 stages:
   - name: test
-    if: commit_message !~ /\[skip tests\]/ AND commit_message !~ /\[force[^\]]*\]/
+    if: commit_message !~ /\[skip tests\]/
   - name: release
     if: commit_message !~ /\[no release\]/ AND (branch = master OR branch =~ /release\/.*/) AND type != pull_request AND fork = false
   - name: update_downstream

scripts/travis/update_downstream.sh

@@ -33,11 +33,7 @@ git status
 git --no-pager diff pom.xml
 git add pom.xml
 
-if [[ "${TRAVIS_COMMIT_MESSAGE}" =~ \[force[^\]]*\] ]]; then
-  FORCE_TOKEN=$(echo "${TRAVIS_COMMIT_MESSAGE}" | sed "s|^.*\(\[force[^]]*\]\).*$|\1|g")
-  git commit --allow-empty -m "${FORCE_TOKEN} Update upstream version to ${VERSION}"
-  git push
-elif git status --untracked-files=no --porcelain | grep -q '^' ; then
+if git status --untracked-files=no --porcelain | grep -q '^' ; then
   git commit -m "Update upstream version to ${VERSION}"
   git push
 else