batchlog_manager: Speed up token_metadata endpoints counting a bit
batchlog_manager: Speed up token_metadata endpoints counting a bit

In this place we only need to know the number of endpoints,
while current code additionally shuffles them before counting.

Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@scylladb.com>

scylladb/scylla,avikivity/scylla,scylladb/scylla,scylladb/scylla,avikivity/scylla,scylladb/scylla,avikivity/scylla