LU-11855 utils: move declarations out of local blocks

LU-11855 utils: move declarations out of local blocks

few variables were declared within local blocks, but used by
pointer when blocks are closed. this schema used to work with
older GCC (due to trivial stack management), but not with GCC8.

Change-Id: Ibd02a72264d50609ccf3c5bc5252e45de4160b9e
Signed-off-by: Alex Zhuravlev <bzzz@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/34026
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Tested-by: Jenkins
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Mike Pershin <mpershin@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>