misc: rename vault from library to hashicorp

Upcoming in Vault 1.14, stop publishing official Dockerhub images and publish only our Verified Publisher images.
Users of Docker images should pull from hashicorp/vault instead of vault.
Verified Publisher images can be found at https://hub.docker.com/r/hashicorp/vault.

Signed-off-by: Yadong Ding <ding_yadong@foxmail.com>

misc/top_images/image_list.txt

@@ -31,7 +31,7 @@ php
 bash
 caddy
 telegraf
-vault
+hashicorp/vault
 couchdb
 eclipse-mosquitto
 cassandra