Modify test results XML format to match the JUnit format.

When this code was developed, we came up with our own XML format for the test
output.  I have since started looking at integration with other tools, namely
continuous integration frameworks, and this format seems to be supported
across a number of applications.  With these changes in place, I was able
to get Atlassian Bamboo to interpret the test results.


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@241855 65c4cc65-6c06-0410-ace0-fbb531ad65f3