Revert "LU-7898 osd: remove unnecessary declarations"

Revert "LU-7898 osd: remove unnecessary declarations"

This patch causes build failures in master due to
reverted LU-7899 6cd79ab5860c5 patch that I failed
to catch in time due to deficiency in my build process.

This cannot be easily fixed since apparently a big
chunk of functionality was yanked from under this patch,
so I can only revert it for now.

This reverts commit ead6df2feee9c143b617cb60e50e403c955bd401.

Change-Id: I5ee89bf0c9260312f157c251b83dd417fa2cf260
Reviewed-on: http://review.whamcloud.com/22293
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Tested-by: Oleg Drokin <oleg.drokin@intel.com>