framework: import MIMEText from the right module

email.MIME* modules were renamed and situated into the email.mime
subpackage, see https://docs.python.org/2/library/email.html

Reported-by: Dirk Cummings <sexynaya2010@hotmail.com>
Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1297111

framework/src/setroubleshoot/email_alert.py

@@ -23,9 +23,9 @@
 
 import syslog
 import re
-from email.MIMEText import MIMEText
-from email.MIMEMultipart import MIMEMultipart
-from email.Utils import formatdate
+from email.mime.text import MIMEText
+from email.mime.multipart import MIMEMultipart
+from email.utils import formatdate
 
 from setroubleshoot.config import get_config
 from setroubleshoot.util import *