YAML, like JSON, is all-unicode. StorageFarmBroker.set_static_servers()
is defined to take an all-unicode dictionary (the "storage:" key from
private/servers.yaml), so the server_id keys it gets will be unicode.
NativeStorageServer is defined to accept server_ids which are bytes (at
least it is now). The tests were only passing bytes into
set_static_servers(), whereas a real launch passed unicode in, causing a
problem when NativeStorageServer tried to base32.a2b() the pubkey and
choked on the unicode it received.
This fixes set_static_servers() to convert the server_id to bytes, and
changes NativeStorageServer to assert that it gets bytes. It also fixes
the test to match real usage more closely.
c56a0a4ba9