(PA-7090) Correct system time on AIX

We are encountering an issue with tests running on AIX due to incorrect
system time. While we are waiting on a permanent fix in ITHELP-99479,
this temporary workaround sets the timesync property on the Beaker host
object to "true" if the host is AIX.

acceptance/tests/ssl/certificate_extensions.rb

@@ -77,6 +77,8 @@
   with_puppet_running_on(master, master_config) do
     agents.each do |agent|
       next if agent == master
+      # Temporarily sync time on AIX to account for incorrect system time (PA-7090)
+      agent.options[:timesync] = true if agent.platform.start_with?('aix')
 
       step "Create agent csr_attributes.yaml on #{agent}"
       agent_csr_attributes = get_test_file_path(agent, "csr_attributes.yaml")