EX-5014 pcc: Readability cleanups

EX-5014 pcc: Readability cleanups

It's really hard to remember what 'inode' and 'file' mean
when there's more than one in a function, so I've redone
some of the names here.

Test-parameters: trivial

Signed-off-by: Patrick Farrell <pfarrell@whamcloud.com>
Change-Id: Ia00d0bda216a26f285f0fda8bc8edd3c51d66ce4
Reviewed-on: https://review.whamcloud.com/47157
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Bobi Jam <bobijam@hotmail.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>