Add additional OS installer images

- Debian 11, Ubuntu 20.04, and OpenBSD 7.0 images
  - Menu is too long, so added pxeboot_boot_images list to determine
    which images to download/include in menu
- Update versions and checksums downloaded for existing images, and use
  version specific paths where applicable.
- Update boot parameters to better support EFI booting
- Update galaxy metadata

Change-Id: Iab6d4385489458ff0e4491c4b1de544b442c2622
diff --git a/molecule/default/prepare.yml b/molecule/default/prepare.yml
index 00ea0fe..975d2dd 100644
--- a/molecule/default/prepare.yml
+++ b/molecule/default/prepare.yml
@@ -21,5 +21,11 @@
       apt:
         update_cache: true
 
+    - name: Install ps command for Debian init.d script to function
+      apt:
+        name:
+          - "procps"
+        state: "present"
+
   roles:
     - nginx