Windows Support: Testing Suite integration

Broaden support for execution of the test suite
on Windows.
General bug and review fixups

lib/spack/llnl/util/lock.py

@@ -191,6 +191,7 @@ def is_valid(op):
         return op == LockType.READ \
             or op == LockType.WRITE
 
+
 class Lock(object):
     """This is an implementation of a filesystem lock using Python's lockf.
 
@@ -617,6 +618,12 @@ def release_write(self, release_fn=None):
             else:
                 return False
 
+    def cleanup(self):
+        if self._reads == 0 and self._writes == 0:
+            os.unlink(self.path)
+        else:
+            raise LockError("Attempting to cleanup active lock.")
+
     def _get_counts_desc(self):
         return '(reads {0}, writes {1})'.format(self._reads, self._writes) \
             if tty.is_verbose() else ''