Remove duplicate configuration

Enable ephemeral storage encryption is already configured above.

Change-Id: I2fbeaeb983208e7654e5fd0dd613fda678fd8b35
diff --git a/tools/pre_test_hook.sh b/tools/pre_test_hook.sh
index 63b123e..f7820f8 100755
--- a/tools/pre_test_hook.sh
+++ b/tools/pre_test_hook.sh
@@ -35,7 +35,3 @@
 # Glance v1 doesn't do signature verification on image upload
 echo -e '[image-feature-enabled]' >> $LOCALCONF_PATH
 echo -e 'api_v1=False' >> $LOCALCONF_PATH
-
-# Enable ephemeral storage encryption in Tempest
-echo -e '[ephemeral_storage_encryption]' >> $LOCALCONF_PATH
-echo -e 'enabled = True' >> $LOCALCONF_PATH