io: use the given ctx for logging in mmap/munmap
io: use the given ctx for logging in mmap/munmap

This commit adds a new argument (named owner_ctx) to functions for mmap.
It is added for resource management, but it is actually not used yet.

GitHub: #513

cosmo0920/groonga,naoa/groonga,groonga/groonga,cosmo0920/groonga,kenhys/groonga,komainu8/groonga,cosmo0920/groonga,naoa/groonga,cosmo0920/groonga,komainu8/groonga,groonga/groonga,naoa/groonga,komainu8/groonga,groonga/groonga,cosmo0920/groonga,groonga/groonga,cosmo0920/groonga,komainu8/groonga,groonga/groonga,naoa/groonga,kenhys/groonga,cosmo0920/groonga,kenhys/groonga,groonga/groonga,komainu8/groonga,naoa/groonga,naoa/groonga,naoa/groonga,komainu8/groonga,komainu8/groonga,kenhys/groonga,komainu8/groonga,groonga/groonga,naoa/groonga,cosmo0920/groonga,kenhys/groonga,kenhys/groonga,groonga/groonga,kenhys/groonga,kenhys/groonga