auxiliary/scanner/http/soap_xml cleanup

This:

* Corrects Ruby style (most) everywhere
* Uses Rex's sleep, converts to milliseconds -- seconds are too granular
* Moves begin/rescue inside nested verb+noun loop
* Prints errors even if not in verbose mode
* Corrects URI construction when PATH ends with /
Add status message that displays delay between requests
Use double quote for xml strings
Land #3526, @jhart-r7's soap_xml scanner cleanup