(maint) Add --user CLI option on delete and list subcommands

To support usage without a configuration file.

Author: nwolfe

lib/vmfloaty.rb

@@ -90,6 +90,7 @@ def run # rubocop:disable Metrics/AbcSize
       c.option '--json', 'Prints information as JSON'
       c.option '--token STRING', String, 'Token for pooler service'
       c.option '--url STRING', String, 'URL of pooler service'
+      c.option '--user STRING', String, 'User to authenticate with'
       c.action do |args, options|
         verbose = options.verbose || config['verbose']
 
@@ -212,6 +213,7 @@ def run # rubocop:disable Metrics/AbcSize
       c.option '--json', 'Outputs hosts scheduled for deletion as JSON'
       c.option '--token STRING', String, 'Token for pooler service'
       c.option '--url STRING', String, 'URL of pooler service'
+      c.option '--user STRING', String, 'User to authenticate with'
       c.action do |args, options|
         verbose = options.verbose || config['verbose']
         service = Service.new(options, config)