LU-10365 tests: set proper paths headers for sanity test 400a

LU-10365 tests: set proper paths headers for sanity test 400a

For the case when /usr/include/lustre doesn't exist sanity test
400a attempts to use the lustre user land headers located in the
source tree. Some of the lustre user land headers are wrappers
around the UAPI headers so we need to include those paths as well.

A test move was done in the linux kernel that moved the UAPI headers
to their proper place. Errors were reported mainly due to
linux/types.h being missing. This could be the reason Ubuntu18 fails
the sanity 400a test.

Test-Parameters: trivial clientdistro=ubuntu1604 testlist=sanity envdefinitions=ONLY=400a

Change-Id: If17da7d9fc4cedb3b9c18feaafbee47d1f94d49b
Signed-off-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-on: https://review.whamcloud.com/31737
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: James Nunez <jnunez@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>