"
This is a collection of assorted patches that will be needed for LWT.
Most of them are trivial, but one touches a lot of files, so have a
good chance to cause rebase headache (I already had to rebase it on
top of Alternator). Lets push them earlier instead of carrying them in
the lwt branch.
"
* 'gleb/lwt-prepare-v2' of github.com:scylladb/seastar-dev:
lwt: make _last_timestamp_micros static
lwt: Add client_state::get_timestamp_for_paxos() function
lwt: Pass client_state reference all the way to storage_proxy::query
exceptions: Add a constructor for unavailable_exception that allows providing a custom message
serializer: Add std::variant support
lwt: Add missing functions to utils/UUID_gen.hh
c6b66d197b