Set overcloud_ssh_user to zuul in upgrades jobs.

Currently, we are using zuul user as overcloud_ssh_user during overcloud
deployment. While for upgrades, we are still passing tripleo-admin. This
is causing the upgrade prepare command to fail.

Change-Id: If4bd02dad8d69ba4c818ba8d800423bcc8ecfea4
Closes-Bug: #1813564

config/general_config/featureset036.yml

@@ -63,7 +63,7 @@ container_registry_file: >-
   {%- endif -%}
 
 # Adjust user to CI
-overcloud_ssh_user: "tripleo-admin"
+overcloud_ssh_user: "zuul"
 
 # Workaround for deploying newton from queen.
 overcloud_prep_post_hook_script: |

config/general_config/featureset037.yml

@@ -25,7 +25,7 @@ tripleo_upgrade_debug: true
 tripleo_upgrade_converge_plan_only: true
 tripleo_ci: true
 use_oooq: true
-overcloud_ssh_user: "tripleo-admin"
+overcloud_ssh_user: "zuul"
 
 network_isolation: false
 enable_pacemaker: false

config/general_config/featureset040.yml

@@ -43,7 +43,7 @@ container_registry_file: >-
 tripleo_ci: true
 use_oooq: true
 tripleo_upgrade_debug: true
-overcloud_ssh_user: "tripleo-admin"
+overcloud_ssh_user: "zuul"
 # Mandatory for deployed_servers
 tripleo_upgrade_validations_non_fatal: true
 # Reduce CI wall time

config/general_config/featureset051.yml

@@ -47,7 +47,7 @@ container_registry_file: >-
 tripleo_ci: true
 use_oooq: true
 tripleo_upgrade_debug: true
-overcloud_ssh_user: "tripleo-admin"
+overcloud_ssh_user: "zuul"
 # Mandatory for deployed_servers
 tripleo_upgrade_validations_non_fatal: true
 # Reduce CI wall time