LU-14789 tests: make sanity 133f and 133g working

LU-14789 tests: make sanity 133f and 133g working

Tests sanity 133f and 133g were doing nothing after change 38567.
Because the argument given to badarea_io was not a path, 0 was always
returned. This patch finds the complete path of the parameters
returned by "lctl get_param" and gives them to badarea_io.

Fixes: 1c54733894f8 ("LU-10401 tests: add -F so list_param prints entry type")
Signed-off-by: Cyril Bordage <cbordage@whamcloud.com>
Change-Id: I7a8914e2950d5a8b2a93948c4fbe889520a3198c
Reviewed-on: https://review.whamcloud.com/44184
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>