[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>
1 file changed