[Lock] remove mention of mongodb

Author: nicolas-grekas

composer.json

@@ -21,7 +21,6 @@
     },
     "require-dev": {
         "doctrine/dbal": "~2.5",
-        "mongodb/mongodb": "~1.1",
         "predis/predis": "~1.0"
     },
     "conflict": {

phpunit.xml.dist

@@ -12,7 +12,6 @@
         <ini name="error_reporting" value="-1" />
         <env name="REDIS_HOST" value="localhost" />
         <env name="MEMCACHED_HOST" value="localhost" />
-        <env name="MONGODB_HOST" value="localhost" />
         <env name="ZOOKEEPER_HOST" value="localhost" />
     </php>