Description of problem:

When updateinfo xml is generated via yum api's specifically update_md.UpdateNotice's xml method, it only accounts for issued date and ignored the updated date.

Version-Release number of selected component (if applicable):
yum-3.2.29-22.el6.noarch

How reproducible:
always

Steps to Reproduce:
1. run the xml method in UpdateNotice with updated date passed in.

  
Actual results:
<updates>
<update from="security" status="final" type="bugfix" version="1">
  <id>RHBA-2012:0145</id>
  <title>python-psycopg2 bug fix and enhancement update</title>
  <release></release>
  <issued date="2012-02-17 00:00:00"/>
  <description>The python-psycopg2 package provides a PostgreSQL database adapter for the
Python programming language.
...

<updates>

Expected results:
<updates>
<update from="security" status="final" type="bugfix" version="1">
  <id>RHBA-2012:0145</id>
  <title>python-psycopg2 bug fix and enhancement update</title>
  <release></release>
  <issued date="2012-02-17 00:00:00"/>
  <description>The python-psycopg2 package provides a PostgreSQL database adapter for the
Python programming language.
...
  <updated date="2012-05-17 00:00:00"/>

<updates>

Additional info:

Patch sent upstream

---
 yum/update_md.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/yum/update_md.py b/yum/update_md.py
index e71f9ef..0f31c31 100644
--- a/yum/update_md.py
+++ b/yum/update_md.py
@@ -330,7 +330,9 @@ class UpdateNotice(object):
                 to_xml(self._md['title']), to_xml(self._md['release']),
                 to_xml(self._md['issued'], attrib=True),
                 to_xml(self._md['description']))
-
+        if self._md['updated']:
+            # include the updated date in the generated xml
+            msg += """ <updated date="%s"\n""" % (to_xml(self._md['updated'], attrib=True))
         if self._md['summary']:
             msg += """  <summary>%s</summary>\n""" % (to_xml(self._md['summary']))
         if self._md['solution']:
-- 
1.7.11.7