Authorities should stop listing relays running pre-0.2.9, or running 0.3.0 through 0.3.4

The release series 0.3.0 through 0.3.4 are no longer supported, and we have encountered at least one bug (legacy/trac#27841 (moved)) caused by them lingering on the network.

We should have the authorities stop listing them in their votes. The patch here is simple enough -- we just edit dirserv_get_status_impl to reject everything newer than "0.3.0.0" and less new than "0.3.5.x" (for some well chosen "x").

But before we do this, we should take necessary steps to contact operators and let them know that they really really need to upgrade.