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.

src/mem/ruby/system/RubySystem.py

@@ -34,7 +34,6 @@ from SimpleMemory import *
 class RubySystem(ClockedObject):
     type = 'RubySystem'
     cxx_header = "mem/ruby/system/System.hh"
-    random_seed = Param.Int(1234, "random seed used by the simulation");
     randomization = Param.Bool(False,
         "insert random delays on message enqueue times");
     block_size_bytes = Param.UInt32(64,

src/mem/ruby/system/System.cc

@@ -45,7 +45,6 @@
 
 using namespace std;
 
-int RubySystem::m_random_seed;
 bool RubySystem::m_randomization;
 uint32_t RubySystem::m_block_size_bytes;
 uint32_t RubySystem::m_block_size_bits;
@@ -60,8 +59,6 @@ RubySystem::RubySystem(const Params *p)
     : ClockedObject(p), m_access_backing_store(p->access_backing_store),
       m_cache_recorder(NULL)
 {
-    m_random_seed = p->random_seed;
-    srandom(m_random_seed);
     m_randomization = p->randomization;
 
     m_block_size_bytes = p->block_size_bytes;

src/mem/ruby/system/System.hh

@@ -70,7 +70,6 @@ class RubySystem : public ClockedObject
     ~RubySystem();
 
     // config accessors
-    static int getRandomSeed() { return m_random_seed; }
     static int getRandomization() { return m_randomization; }
     static uint32_t getBlockSizeBytes() { return m_block_size_bytes; }
     static uint32_t getBlockSizeBits() { return m_block_size_bits; }
@@ -129,7 +128,6 @@ class RubySystem : public ClockedObject
 
   private:
     // configuration parameters
-    static int m_random_seed;
     static bool m_randomization;
     static uint32_t m_block_size_bytes;
     static uint32_t m_block_size_bits;