perf: add a script for setting environment

"Benchmarking" article [0] in Tarantool's wiki contains a lot of
recommendations that help to setup the Linux operating system and
avoid potential reproducibility pitfalls when executing
performance tests in a Linux-based environment. These
recommendations written in plain text with examples of commands
that could be executed manually. We desire to execute benchmarks
automatically and in continuous mode, therefore we need a way to
setup the test environment automatically before running
benchmarks.

There are many guides with benchmarking tips, but unfortunately
there is no script that will do these steps automatically.
I found only temci [1] and pyperf (`pyperf system` [2]) projects.

The patch adds a script for setting the environment before running
performance tests. All settings used in the proposed script are
described in the article [3]. Note, that uncertain settings were
not implemented.

0. https://github.com/tarantool/tarantool/wiki/Benchmarking
1. https://github.com/parttimenerd/temci
2. https://github.com/travisdowns/uarch-bench/blob/master/uarch-bench.sh
3. https://pyperf.readthedocs.io/en/latest/cli.html#system-cmd

NO_CHANGELOG=performance
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