(maint) Fix the argument list for nonstandardpooler

Prior to this commit, 7 arguments would be sent into the `retrieve`
method in nonstandardpooler. There were only 6 arguments in the method
definition so an error would be thrown. This commit adds the `ondemand`
argument to the `retrieve` method, but does not utilize it.

Author: Jarret Lavallee

lib/vmfloaty/nonstandard_pooler.rb

@@ -22,7 +22,7 @@ def self.list_active(verbose, url, token, _user)
     status['reserved_hosts'] || []
   end
 
-  def self.retrieve(verbose, os_type, token, url, _user, _options)
+  def self.retrieve(verbose, os_type, token, url, _user, _options, ondemand = nil)
     conn = Http.get_conn(verbose, url)
     conn.headers['X-AUTH-TOKEN'] = token if token