prefetcher: Calculate prefetch priority based on whether the TLF is being synced. Also expand the range of potential prefetch priorities that aren't on-demand.
prefetcher: Calculate prefetch priority based on whether the TLF is being synced. Also expand the range of potential prefetch priorities that aren't on-demand.

keybase/client,keybase/client,keybase/kbfs,keybase/client,keybase/kbfs,keybase/client,keybase/client,keybase/client,keybase/kbfs,keybase/kbfs,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client,keybase/client