Increase racreset retries to handle iDRAC instability after clear-jobs (#778)

After --clear-jobs --force, the iDRAC can take up to ~2 minutes before
its Redfish Systems endpoint responds again, causing --racreset to fail
with "ComputerSystem's Members array is either empty or missing". Add
retries (15) and delay (10s) to allow the iDRAC time to stabilize.

Author: mcornea

ansible/roles/boot-iso/tasks/dell.yml

@@ -38,6 +38,8 @@
     badfish_password: "{{ hostvars[item]['bmc_password'] }}"
     badfish_args:
       - "--racreset"
+    retries: 15
+    delay: 10
     ignore_errors: true
   when: reset_idrac | bool