[dovecot/core] c26643: lib: Add pool_alloconly_create_clean()

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/dovecot/core
  Commit: c2664306fcea8bcaafd19a6d1b683ef0ad0ece91
      https://github.com/dovecot/core/commit/c2664306fcea8bcaafd19a6d1b683ef0ad0ece91
  Author: Timo Sirainen <timo.sirainen at dovecot.fi>
  Date:   2017-02-13 (Mon, 13 Feb 2017)

  Changed paths:
    M src/lib/mempool-alloconly.c
    M src/lib/mempool.h

  Log Message:
  -----------
  lib: Add pool_alloconly_create_clean()

This partially reverts 2a2beae3a4c1e75b3aeff996781503138e6f24bc