With Red Hat Enterprise Linux 6.10 released on June 20, 2018, we need make Lustre b2_10 branch support it.

Red Hat Enterprise Linux 6.10 Announcement:
https://access.redhat.com/announcements/3490171

Release Notes for Red Hat Enterprise Linux 6.10:
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html-single/6.10_release_notes/

Technical Notes for Red Hat Enterprise Linux 6.10:
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html-single/6.10_technical_notes/