LF build: use lf.local instead of e2etest.lf.local

On the build agent, both e2etest.languageforge.local and
languageforge.local point to the same webserver definition. We may use
e2etest.languageforge.local by preference in the future, but for now we
want to make the build agent's process as similar as possible to what
happens on developer machines, where the site name is languageforge.local
with no e2etest.