contrail-vrouter-dpdk cannot use 1G hugepages on linux kernel 4.13+

[Mikhail Chernik]

Starting from Linux kernel 4.13-rc1 format reporting hugetlbfs page size is changed:

OLD: Hugetlbfs-kvm /mnt/hugepages_1G hugetlbfs mode=775,pagesize=1G 0 0
NEW: Hugetlbfs-kvm /mnt/hugepages_1G hugetlbfs rw,relatime,mode=775,pagesize=1024M 0 0

(commit: https://github.com/torvalds/linux/commit/4a25220d4e43bb2461823dbc7eb1502a34087958 )

OpenContrail checks available page sizes by comparing mounted huge page options to "1G":

     if (strstr(options, "pagesize=1G")) {

https://github.com/Juniper/contrail-vrouter/blob/master/dpdk/vr_dpdk_table_mem.c#L74

Since pagesize is now displayed as "1024M", OpenContrail fails to recognize that 1G hugepages are available, and does not try to allocate memory. If only 1G hugepages are available on a system, contrail-vrouter-dpdk fails to start.

The issues affects all supported versions, including master branch