scripts: perftune.py: don't allow cpu-mask that does't include any IRQ CPU
scripts: perftune.py: don't allow cpu-mask that does't include any IRQ CPU

Don't allow the --cpu-mask value that doesn't include any CPU that we are
going to use for binding IRQs to.

For instance the combination of parameters '--cpu-mask 0xe --mode sq'
is forbidden.

Throw an exception with the corresponding error message in such a case.

Signed-off-by: Vlad Zolotarov <976c0f8d0852ed6439ad273880b400a75a7c41d0@scylladb.com>
Message-Id: <1519271876-22857-1-git-send-email-976c0f8d0852ed6439ad273880b400a75a7c41d0@scylladb.com>

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