software/ors-amarisoft: ru/*: Pull testing initialization and default into one place

Less need to keep default synchronized and less noise in the code. We will need
to refer to `testing` more in the next patch, so it will help a bit.

/cc @lu.xu, @tomo, @xavier_thompson, @Daetalus
/reviewed-by @jhuge
/reviewed-on nexedi/slapos!1514