phantomjs isn't reliable and we've moved to sharing the reports via a webserver.
Update the scripts to more match those being used in the autobuilder helper
where the html email support was removed.
(From OE-Core rev: b5c131006e3fad0a15e6cdf81f71dc1e96647028)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>