LU-9102 test: Include specific headers needed by Posix suite

LU-9102 test: Include specific headers needed by Posix suite

Change prefix to the missing headers on el7

Change-Id: I79d59104a224ccf51795072e2a12da1a113cdaa0
Signed-off-by: Wei Liu <wei3.liu@intel.com>
Reviewed-on: https://review.whamcloud.com/25606
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Minh Diep <minh.diep@intel.com>
Reviewed-by: James Nunez <james.a.nunez@intel.com>
Reviewed-by: Jian Yu <jian.yu@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>