Fix utf8mb4 on vendor tables

When creating the schema for test these tables use default length for
string: 255. Which fail when using utf8mb4.

> Syntax error or access violation: 1071 Specified key was too long; max key length is 767 bytes

Also move the `setKeepStaticConnections` in before and after class to
avoid:

> SAVEPOINT DOCTRINE2_SAVEPOINT_2 does not exist

See https://github.com/dmaicher/doctrine-test-bundle#troubleshooting

1 files changed, 16 insertions, 0 deletions

diff --git a/src/Wallabag/ApiBundle/Entity/AccessToken.php b/src/Wallabag/ApiBundle/Entity/AccessToken.php
index c09a0c80..5e4099dd 100644
--- a/src/Wallabag/ApiBundle/Entity/AccessToken.php
+++ b/src/Wallabag/ApiBundle/Entity/AccessToken.php
@@ -8,6 +8,22 @@ use FOS\OAuthServerBundle\Entity\AccessToken as BaseAccessToken;
 /**
  * @ORM\Table("oauth2_access_tokens")
  * @ORM\Entity
+ * @ORM\AttributeOverrides({
+ *     @ORM\AttributeOverride(name="token",
+ *         column=@ORM\Column(
+ *             name   = "token",
+ *             type   = "string",
+ *             length = 191
+ *         )
+ *     ),
+ *     @ORM\AttributeOverride(name="scope",
+ *         column=@ORM\Column(
+ *             name   = "scope",
+ *             type   = "string",
+ *             length = 191
+ *         )
+ *     )
+ * })
  */
 class AccessToken extends BaseAccessToken
 {