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config: allow guest to perform failover.execute

This patch grants the guest user runtime privileges for running
`failover.execute` function. This is an internal function used by the
supervised failover coordinator. This privileges are needed for the
guest user to be able to perform the initial bootstrap since there is no
other users available before it.

Technically it's a part of a native and supervised bootstrap strategy
support allowing the external agent (i.e the supervised failover
coordinator) to perform the initial bootstrap.

Needed for tarantool/tarantool-ee#1194

NO_TEST=will be tested in EE

@TarantoolBot document
Title: config: `bootstrap_strategy` now grants privileges in some cases

`replication.bootstrap_strategy` needs a note on the granted privileges
at the end of the various bootstrap strategies descriptions.

Note: when using bootstrap strategies `supervised` or `native` with a
supervised failover (see `replication.failover` configuration option)
Tarantool automatically grants the guest user privileges allowing to
execute the internal `failover.execute` call for performing the initial
cluster bootstrap.

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