[autotest] blacklist dev_server_test

BUG=chromium:251395
TEST=Run utils/unittest_suite.py inside chroot. Does not hang on a
dev_server_test unittest waiting for a password. (A bunch of tests fail
inside of the chroot still, but that is a separate issue).

Change-Id: Id4a908d13d6f6549afce401bbb27bcda29793888
Reviewed-on: https://gerrit.chromium.org/gerrit/59097
Commit-Queue: Aviv Keshet <akeshet@chromium.org>
Reviewed-by: Aviv Keshet <akeshet@chromium.org>
Tested-by: Aviv Keshet <akeshet@chromium.org>
diff --git a/utils/unittest_suite.py b/utils/unittest_suite.py
index 950dab6..c47098e 100755
--- a/utils/unittest_suite.py
+++ b/utils/unittest_suite.py
@@ -90,6 +90,8 @@
     'monitor_db_functional_test.py',
     # crbug.com/249377
     'reporting_unittest.py',
+    # crbug.com/251395
+    'dev_server_test.py',
     ))
 
 LONG_TESTS = (REQUIRES_MYSQLDB |