made update_request_xml not always append tags
made update_request_xml not always append tags

this was causing duplicate hostid tags to appear in the request xml
when something went wrong, which is bad. This is now fixed

Signed-off-by: Sam Phippen <e5a09176608998a68778e11d5021c871e8fae93c@googlemail.com>

LukeusMaximus/Wubulous,LukeusMaximus/Wubulous