simplify thread names

Author: AlexanderZagaynov

lib/concurrent/executor/ruby_thread_pool_executor.rb

@@ -300,7 +300,7 @@ def initialize(pool, id: nil)
         @queue  = Queue.new
         @pool   = pool
         @thread = create_worker @queue, pool, pool.idletime
-        @thread.name = [pool.name, self.class.name, id].compact.join('-')
+        @thread.name = [pool.name, 'worker', id].compact.join('-')
       end
 
       def <<(message)

spec/concurrent/executor/ruby_thread_pool_executor_spec.rb

@@ -75,14 +75,14 @@ module Concurrent
       context 'without pool name' do
         let(:pool_name) { }
         it 'sets counted name' do
-          expect(names.all? { |name| name =~ /^Concurrent.*Worker-\d+$/ }).to be true
+          expect(names.all? { |name| name =~ /^worker-\d+$/ }).to be true
         end
       end
 
       context 'with pool name' do
         let(:pool_name) { 'MyExecutor' }
         it 'sets counted name' do
-          expect(names.all? { |name| name =~ /^MyExecutor-Concurrent.*Worker-\d+$/ }).to be true
+          expect(names.all? { |name| name =~ /^MyExecutor-worker-\d+$/ }).to be true
         end
       end
     end