Travis CI Memcache Service and Settings (#3082)

* Start memcached service and add php extension.
* Check status of memcached service.
* Use blt memcache config on CI.

.travis.yml

@@ -35,6 +35,9 @@ cache:
   - "$HOME/.nvm"
   -  "/tmp/blt-sandbox-instance/.rules"
 
+services:
+- memcached
+
 addons:
   ssh_known_hosts: []
   chrome: stable
@@ -44,6 +47,8 @@ before_install:
   - source ${BLT_DIR}/scripts/travis/exit_early
   # Decrypt private SSH key id_rsa_blt.enc, save as ~/.ssh/id_rsa_blt.
   - if [[ "$TRAVIS_PULL_REQUEST" == "false" ]]; then openssl aes-256-cbc -K $encrypted_c0b166e924da_key -iv $encrypted_c0b166e924da_iv -in id_rsa_blt.enc -out ~/.ssh/id_rsa -d; chmod 600 ~/.ssh/id_rsa; ls -lash ~/.ssh; eval "$(ssh-agent -s)"; ssh-add ~/.ssh/id_rsa; fi
+  - echo "extension = memcached.so" >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini
+  - sudo service memcached status
   - phpenv config-rm xdebug.ini
   - phpenv config-add travis.php.ini
   - composer self-update

settings/cache.settings.php

@@ -35,7 +35,7 @@
  *
  * @see https://www.drupal.org/node/2766509
  */
-if ($is_ah_env &&
+if (($is_ah_env || $is_ci_env) &&
   array_key_exists('memcache', $settings) &&
   array_key_exists('servers', $settings['memcache']) &&
   !empty($settings['memcache']['servers'])