Ruby: remove the files related to the tracer

The Ruby Tracer is out of date with the changes that are being carried
out to support checkpointing. Hence, it needs to be removed.

configs/ruby/Ruby.py

@@ -154,11 +154,8 @@ def create_system(options, system, piobus = None, dma_devices = []):
 
     ruby_profiler = RubyProfiler(ruby_system = ruby,
                                  num_of_sequencers = len(cpu_sequencers))
-    ruby_tracer   = RubyTracer(ruby_system = ruby)
-    
     ruby.network = network
     ruby.profiler = ruby_profiler
-    ruby.tracer = ruby_tracer
     ruby.mem_size = total_mem_size
     ruby._cpu_ruby_ports = cpu_sequencers
     ruby.random_seed    = options.random_seed