ruby: remove random seed

We no longer use the C library based random number generator: random().
Instead we use the C++ library provided rng.  So setting the random seed for
the RubySystem class has no effect.  Hence the variable and the corresponding
option are being dropped.

configs/ruby/Ruby.py

@@ -82,9 +82,6 @@ def define_options(parser):
     parser.add_option("--recycle-latency", type="int", default=10,
                       help="Recycle latency for ruby controller input buffers")
 
-    parser.add_option("--random_seed", type="int", default=1234,
-                      help="Used for seeding the random number generator")
-
     protocol = buildEnv['PROTOCOL']
     exec "import %s" % protocol
     eval("%s.define_options(parser)" % protocol)
@@ -236,7 +233,6 @@ def create_system(options, full_system, system, piobus = None, dma_ports = []):
 
     ruby._cpu_ports = cpu_sequencers
     ruby.num_of_sequencers = len(cpu_sequencers)
-    ruby.random_seed    = options.random_seed
 
     # Create a backing copy of physical memory in case required
     if options.access_backing_store: