LU-17050 tests: remove sanity-sec IDENTITY_UPCALL

LU-17050 tests: remove sanity-sec IDENTITY_UPCALL

In sanity-sec.sh there was an IDENTITY_UPCALL variable that
conflicted with an identically-named global variable in
test-parameters.  Due to new checks by Gerrit Janitor, this
was causing any patch that ran sanity-sec.sh to log a warning.

Remove the parameter from sanity-sec.sh as it is unused.
Update code style in functions upcating identity_upcall.

Test-Parameters: trivial testlist=sanity-sec mdscount=2 mdtcount=4
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: I2f2ace33cf01153d16f4f25038065d33443ebbe5
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/52400
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Sebastien Buisson <sbuisson@ddn.com>
Reviewed-by: Alex Deiter <alex.deiter@gmail.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>