Define env vars in .env file only

The tests are using env vars to run. These env vars are storing the
credentials to the different backends.

For the CI, these env vars are set on the project settings (on travis
for instance).

For the development of Gaufrette, and considering the merge of (#580),
the tests should be ran using docker.
The docker setup uses env vars defined in .env files, so we no longer
need to define such vars in the phpunit.xml file.

Author: nicolasmure

.env.dist

@@ -2,25 +2,25 @@ AWS_KEY=
 AWS_SECRET=
 AWS_BUCKET=
 
-MONGO_URI=mongodb://mongodb:27017
-MONGO_DBNAME=gridfs_test
-
-SFTP_HOST=sftp
-SFTP_PORT=22
-SFTP_USER=gaufrette
-SFTP_PASSWORD=gaufrette
-SFTP_BASE_DIR=gaufrette
+AZURE_ACCOUNT=
+AZURE_KEY=
+AZURE_CONTAINER=
 
 FTP_HOST=ftp
 FTP_PORT=21
 FTP_USER=gaufrette
 FTP_PASSWORD=gaufrette
 FTP_BASE_DIR=/gaufrette
 
-AZURE_ACCOUNT=
-AZURE_KEY=
-AZURE_CONTAINER=
+MONGO_URI=mongodb://mongodb:27017
+MONGO_DBNAME=gridfs_test
 
 RACKSPACE_USER=
 RACKSPACE_APIKEY=
 RACKSPACE_CONTAINER=
+
+SFTP_HOST=sftp
+SFTP_PORT=22
+SFTP_USER=gaufrette
+SFTP_PASSWORD=gaufrette
+SFTP_BASE_DIR=gaufrette

phpunit.xml.dist

@@ -10,39 +10,7 @@
          stopOnFailure="false"
          bootstrap="vendor/autoload.php"
 >
-
-    <php>
-        <!-- Parameters for GridFS adapter -->
-        <!--<env name="MONGO_URI" value="mongodb://localhost:27017" />
-        <env name="MONGO_DBNAME" value="gridfs_test" />-->
-
-        <!-- Configuration for AwsS3 adapter -->
-        <!--<env name="AWS_KEY" value="" />
-        <env name="AWS_SECRET" value="" />
-        <env name="AWS_BUCKET" value="" />-->
-
-        <!-- Configuration for PhpseclibSftp adapter -->
-        <!--<env name="SFTP_HOST" value="" />
-        <env name="SFTP_PORT" value="" />
-        <env name="SFTP_USER" value="" />
-        <env name="SFTP_PASSWORD" value="" />-->
-
-        <!-- Configuration for Ftp adapter -->
-        <!--<env name="FTP_HOST" value="" />
-        <env name="FTP_USER" value="" />
-        <env name="FTP_PASSWORD" value="" />
-        <env name="FTP_BASE_DIR" value="" />-->
-
-        <!-- Configuration for Azure adapter -->
-        <!--<env name="AZURE_ACCOUNT" value="" />
-        <env name="AZURE_KEY" value="" />
-        <env name="AZURE_CONTAINER" value="" />-->
-
-        <!-- Configuration for OpenCloud/Rackspace adapter -->
-        <!--<env name="RACKSPACE_USER" value="" />
-        <env name="RACKSPACE_APIKEY" value="" />
-        <env name="RACKSPACE_CONTAINER" value="" />-->
-    </php>
+    <!-- The env vars are defined in the .env file -->
 
     <testsuites>
         <testsuite name="Gaufrette Test Suite">