LP#1703411 XMPP opensrf sub-element repairs

LP#1703411 XMPP opensrf sub-element repairs

* Message template typo repair -- missing "'"
* XPath repair on path to opensrf sub-element for Perl
* Move 'type' attribute get/set back up to the <message> for Perl.
* Clean up code duplication in the C message building libs.
* Squash a centuries-old memory leak where xmlFree(sender) was only
  called if a router_from was not supplied.

Signed-off-by: Bill Erickson <berickxx@gmail.com>
Signed-off-by: Jason Stephenson <jason@sigio.com>
Signed-off-by: Mike Rylander <mrylander@gmail.com>