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588a065304
On severl instance types in AWS and Azure, we get the following failure during scylla_io_setup process: ``` ERROR 2021-04-14 07:50:35,666 [shard 5] seastar - Could not setup Async I/O: Resource temporarily unavailable. The most common cause is not enough request capacity in /proc/sys/fs/aio-max-nr. Try increasing that number or reducing the amount of logical CPUs available for your application ``` We have scylla_prepare:configure_io_slots() running before the scylla-server.service start, but the scylla_io_setup is taking place before 1) Let's move configure_io_slots() to scylla_util.py since both scylla_io_setup and scylla_prepare are import functions from it 2) cleanup scylla_prepare since we don't need the same function twice 3) Let's use configure_io_slots() during scylla_io_setup to avoid such failure Fixes: #8587 Closes #8512