Switch to single, pre-existing Jenkins user

manifests/jenkins/master.pp

@@ -17,7 +17,7 @@ class tails::jenkins::master (
   Enum['present', 'absent'] $automatic_iso_jobs_generator = 'present',
   Integer $active_branches_max_age_in_days                = 49,
   String $gitolite_pubkey_name                            = 'gitolite@puppet-git',
-  String $api_user                                        = 'admin',
+  String $api_user                                        = 'Tails',
 
   Boolean $manage_mount                                   = false,
   $mount_device                                           = false,

manifests/jenkins/slave.pp

 # Manage resources that are common to all Tails Jenkins slaves
 class tails::jenkins::slave (
   String $api_token,
-  String $api_user        = 'admin',
+  String $api_user        = 'Tails',
   String $master_url      = "http://jenkins.${::domain}:8080",
   Stdlib::Fqdn $node_name = $::hostname,
 ) {