Change authentication error message (patch)

Hello,

Instead of pushing extra info to the logs I decided that we could
without giving away extra details per policy. I wrote the error message
in a way that tells the most obvious problems, without admitting to any
of them. Please see attached:

diff --git a/src/backend/libpq/auth.c b/src/backend/libpq/auth.c
index 415b614..a775534 100644
--- a/src/backend/libpq/auth.c
+++ b/src/backend/libpq/auth.c
@@ -270,7 +270,7 @@ auth_failed(Port *port, int status)
break;
case uaPassword:
case uaMD5:
- errstr = gettext_noop("password authentication
failed for user \"%s\"");
+ errstr = gettext_noop("password, username or
password expiry failed for user \"%s\"");
/* We use it to indicate if a .pgpass password
failed. */
errcode_return = ERRCODE_INVALID_PASSWORD;
break;