Remove deprecated use_guestagent_template

The parameter has had no effect since the previous cycle[1].

[1] 4d87fa2c69

Depends-on: https://review.opendev.org/874371
Change-Id: I76794b9bff3873419673a7f5ee5efc9473c0a169

manifests/taskmanager.pp

@@ -46,12 +46,6 @@
 #   Trove taskmanager entry point.
 #   Defaults to 'trove.taskmanager.manager.Manager'.
 #
-# DEPRECATED PARAMETERS
-#
-# [*use_guestagent_template*]
-#   (optional) Use template to provision trove guest agent configuration file.
-#   Defaults to false.
-#
 class trove::taskmanager(
   $enabled                  = true,
   $manage_service           = true,
@@ -59,8 +53,6 @@ class trove::taskmanager(
   $package_ensure           = 'present',
   $guestagent_config_file   = '/etc/trove/trove-guestagent.conf',
   $taskmanager_manager      = 'trove.taskmanager.manager.Manager',
-  # DEPRECATED PARAMETERS
-  $use_guestagent_template  = undef,
 ) inherits trove {
 
   include trove::deps

releasenotes/notes/remove-use_guestagent_template-68282b363e234266.yaml

@@ -0,0 +1,5 @@
+---
+upgrade:
+  - |
+    The ``trove::taskmanager::use_guestagent_template`` parameter has been
+    removed.