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wal: add stubs for wal_retention_period

This commit adds a new configuration option wal_retention_period and
function stubs for it. It's needed to avoid rebootstrap on anonymous
replicas, as Tarantool doesn't save xlog for them.

The new option takes a floating point number that sets the period
for every xlog file during which this xlog file cannot be deleted
by garbage collector. The default value is 0, which means no delay.
The option can be set dynamically.

Note:
- The delay is applied after xlog closing
- During instance restart delay becomes box.cfg.wal_retention_period -
  last modification time of xlog.
- The minimum vclock (same as xlog file name) can be found with
  box.info.gc().wal_retention_vclock.

The option value is stored and used in C code, so we define
configuration callbacks in EE: cfg_set_wal_retention_period.

Needed for tarantool/tarantool-ee#513

NO_DOC=EE
NO_CHANGELOG=EE

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