Move amphora_image_name|url to defaults

Change-Id: I511cbcd518df1b511837a7633f2967b4cb9a5782
Prod-related: PROD-26621 (PROD:26621)
(cherry picked from commit 2ecced2c82f7a451a03e001c8a0cdc8bb2f4b5e0)
diff --git a/barbican/client/v1/signed_images/octavia.yml b/barbican/client/v1/signed_images/octavia.yml
index ae708cf..ecc06e5 100644
--- a/barbican/client/v1/signed_images/octavia.yml
+++ b/barbican/client/v1/signed_images/octavia.yml
@@ -4,9 +4,6 @@
 parameters:
   _param:
     octavia_image_cert_key: '/etc/octavia/certs/image.key'
-    amphora_image_name:  "amphora-x64-haproxy"
-
-
   barbican:
     client:
       signed_images:
@@ -17,4 +14,4 @@
               secret_name: 'OctaviaAmphoraSecret'
               cert_key: ${_param:octavia_image_cert_key}
               name: ${_param:amphora_image_name}
-              cloud_name: octavia_identity
\ No newline at end of file
+              cloud_name: octavia_identity