Test hard-codes a string containing '\n' and then expects echo
to interpret it as a newline, which it does not without the -e option.
This fixes flaky test runs like the below:
>>> Running /root/src/github.com/weaveworks/weave/test/150_connect_forget_2_test.sh on [138.68.153.213 138.68.149.186]
>>> Test /root/src/github.com/weaveworks/weave/test/150_connect_forget_2_test.sh finished after 12.4 secs with error: exit status 1
test #5 "direct_peers 138.68.149.186 | sort" failed:
expected "138.68.153.213\n138.68.149.186"
got "138.68.149.186\n138.68.153.213"
Marc CARRE