The test was failing because the sasl module no longer accepts PLAIN auth on
insecure connections.
* gnu/tests/messaging.scm (%test-prosody): Configure test prosody to allow all
auth types on insecure connections.
Change-Id: I142f3b6ccbdde4bdde86ce0698fea7d5509fc200
Signed-off-by: Liliana Marie Prikler <liliana.prikler@gmail.com>