Setup the correct ec2 manifest path

setup correctly the path to the ec2 boundled images.

Change-Id: If3bce845e009a73c6b685976de3fa6d44b907bed
diff --git a/lib/tempest b/lib/tempest
index c74f00d..a3df45e 100644
--- a/lib/tempest
+++ b/lib/tempest
@@ -310,6 +310,9 @@
     iniset $TEMPEST_CONFIG boto ec2_url "http://$SERVICE_HOST:8773/services/Cloud"
     iniset $TEMPEST_CONFIG boto s3_url "http://$SERVICE_HOST:${S3_SERVICE_PORT:-3333}"
     iniset $TEMPEST_CONFIG boto s3_materials_path "$BOTO_MATERIALS_PATH"
+    iniset $TEMPEST_CONFIG boto ari_manifest cirros-0.3.1-x86_64-initrd.manifest.xml
+    iniset $TEMPEST_CONFIG boto ami_manifest cirros-0.3.1-x86_64-blank.img.manifest.xml
+    iniset $TEMPEST_CONFIG boto aki_manifest cirros-0.3.1-x86_64-vmlinuz.manifest.xml
     iniset $TEMPEST_CONFIG boto instance_type "$boto_instance_type"
     iniset $TEMPEST_CONFIG boto http_socket_timeout 30
     iniset $TEMPEST_CONFIG boto ssh_user ${DEFAULT_INSTANCE_USER:-cirros}