LU-13485 build: remove parallel configure dir

LU-13485 build: remove parallel configure dir

This patch removes the temporary directory for
parallel configure tests at the end of configure
to avoid checking the already generated modules
while configuring the same Lustre codes with
a different kernel.

Lustre-change: https://review.whamcloud.com/47077
Lustre-commit: TBD (from e0db865abbe8d7fe3a61a649a17f70a88741eb66)

Change-Id: I4505fb932954531d262b5380f17b3df75a80bfa0
Signed-off-by: Jian Yu <yujian@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/47081
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Minh Diep <mdiep@whamcloud.com>
Reviewed-by: Nathaniel Clark <nclark@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>