[TASK] Travis: Active memcached and redis tests

In the early php7 days on travis redis.so and
memcached.so were missing, so the tests were skipped.
Load the two modules now to executed those tests again.

Change-Id: Ic772604bca24696e94596dd29862a70bcc2a560d
Resolves: #76375
Releases: master
Reviewed-on: https://review.typo3.org/48403


Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>

.travis.yml

@@ -50,6 +50,8 @@ notifications:
 
 before_script:
   - phpenv config-rm xdebug.ini
+  - echo "extension = memcached.so" >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini
+  - echo "extension = redis.so" >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini
   - if [ "$GITHUB_COMPOSER_AUTH" ]; then composer config -g github-oauth.github.com $GITHUB_COMPOSER_AUTH; fi
   - composer install
   - typo3/sysext/core/Build/Configuration/TravisNginxFpm/ConfigureStartNginxFpm.sh