Subcommand shouldn't crash just because a debug directory already exists.

From: Steve Howard <showard@google.com>
Signed-off-by: John Admanski <jadmanski@google.com>



git-svn-id: http://test.kernel.org/svn/autotest/trunk@1224 592f7852-d20e-0410-864c-8624ca9c26a4
diff --git a/server/subcommand.py b/server/subcommand.py
index 974e4e2..26b167e 100644
--- a/server/subcommand.py
+++ b/server/subcommand.py
@@ -106,7 +106,8 @@
 			if not os.path.exists(self.subdir):
 				os.mkdir(self.subdir)
 			self.debug = os.path.join(self.subdir, 'debug')
-			os.mkdir(self.debug)
+			if not os.path.exists(self.debug):
+				os.mkdir(self.debug)
 			self.stdout = os.path.join(self.debug, 'stdout')
 			self.stderr = os.path.join(self.debug, 'stderr')
 		else: