Description of problem:

After upgrading ovirt from 3.5 to 3.6 emails sent from broker have "corrupted" headers.

At the ent of message we can see:

-----
Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Date: Mon, 09 Nov 2015 11:33:37 +0100
Message-Id: <20151109103337.D9C7D1260001.lan>
From: mysender
To: undisclosed-recipients:;

From: mysender
To: myreceiver
Subject: ovirt-hosted-engine state transition
EngineUp-GlobalMaintenance

The state machine changed state.
-----

From and To are repeated twice. This cause that email client show
correctly the sender butan empty recipient and an empty subject.

On message body I see everything after "To: undisclosed-recipients:;"

Version-Release number of selected component (if applicable):

ovirt-hosted-engine-ha-1.3.3.3-1.el7.centos.noarch

How reproducible:

Always

Steps to Reproduce:

Put hosted engine in global maintenance mode to make broker send an email

Actual results:

From and To headers are repeated twice.

Expected results:

Only one From and To header with filled correctly

Additional info:

This pach from Martin Sivak <msivak> solve the problem:

diff --git a/ovirt_hosted_engine_ha/broker/notifications.py b/ovirt_hosted_engin
index 425822d..00e7e60 100644
--- a/ovirt_hosted_engine_ha/broker/notifications.py
+++ b/ovirt_hosted_engine_ha/broker/notifications.py
@@ -1,4 +1,4 @@
-from email.mime.text import MIMEText
+from email.parser import Parser
 from email.utils import formatdate
 import socket

@@ -24,7 +24,7 @@ def send_email(cfg, email_body):
         server = smtplib.SMTP(cfg["smtp-server"], port=cfg["smtp-port"])
         server.set_debuglevel(1)
         to_addresses = EMAIL_SPLIT_RE.split(cfg["destination-emails"].strip())
-        message = MIMEText(email_body)
+        message = Parser().parsestr(email_body)
         message["Date"] = formatdate(localtime=True)
         server.sendmail(cfg["source-email"],
                         to_addresses,