Lower log-message for blocked email to INFO

Gerrit performing what the admin have configured it to do shouldn't be
a WARNING.

Release-Notes: skip
Change-Id: Idbaf53f1c1ac0dbdef70dc849b90ed82cc0a1aef

java/com/google/gerrit/server/mail/send/SmtpEmailSender.java

diff --git a/java/com/google/gerrit/server/mail/send/SmtpEmailSender.java b/java/com/google/gerrit/server/mail/send/SmtpEmailSender.java
index c06cc1e..14b3035 100644
--- a/java/com/google/gerrit/server/mail/send/SmtpEmailSender.java
+++ b/java/com/google/gerrit/server/mail/send/SmtpEmailSender.java
@@ -159,7 +159,7 @@
     if (denyrcpt.contains(address)
         || denyrcpt.contains(domain)
         || denyrcpt.contains("@" + domain)) {
-      logger.atWarning().log("Not emailing %s (prohibited by sendemail.denyrcpt)", address);
+      logger.atInfo().log("Not emailing %s (prohibited by sendemail.denyrcpt)", address);
       return true;
     }