We will want to be able to open perf event streams with these options so
that we can get the build-id extracted from an ELF without having to rely
on parsing it at resolution time.
Additionally, it could give us an option for live-decoding at some point
in userspace without having to write the major DWARF capture data to disk.
This removes -Dagent and just uses -Dtools as it only affects sysprof-cli
and sysprof-agent. We still need to patch sysprof-cli for recent changes
as we did for sysprof-agent though.
Additionally, we haven't used the v2 service in forever, so drop that as
I can't imagine anyone has been using it.
