Passes cache location to tests and runs the tests in parallel.

lib/cros_build_lib.py

Index: lib/cros_build_lib.py
diff --git a/lib/cros_build_lib.py b/lib/cros_build_lib.py
index 22f7de946eeb922d166127eb45c87f9ba72184f0..11fa40cac9cf94813f27c70fda281940124f1f96 100644
--- a/lib/cros_build_lib.py
+++ b/lib/cros_build_lib.py
@@ -6,6 +6,7 @@
 
 import inspect
 import os
+import re
 import subprocess
 import sys
 
@@ -245,3 +246,21 @@ def ReinterpretPathForChroot(path):
 
   new_path = os.path.join('/home', os.getenv('USER'), 'trunk', relative_path)
   return new_path
+
+
+def GetIPAddress(device='eth0'):
+  """Returns the IP Address for a given device using ifconfig.
+
+  socket.gethostname() is insufficient for machines where the host files are
+  not set up "correctly."  Since some of our builders may have this issue,
+  this method gives you a generic way to get the address so you are reachable
+  either via a VM or remote machine on the same network.
+  """
+  ifconfig_output = RunCommand(['ifconfig', device], redirect_stdout=True,
+                               print_cmd=False)
+  match = re.search('.*inet addr:(\d+\.\d+\.\d+\.\d+).*', ifconfig_output)
+  if match:
+    return match.group(1)
+  else:
+    Warning('Failed to find ip address in %s' % ifconfig_output)
+    return None