[COMMANDS] Add "host vapool state" command

We use buddy allocator to manage VAPOOL hence this patch introduce
"host vapool state" command to dump state of VAPOOL buddy allocator.

We also do few other cosmetic changes to host command such as:
1. Rename "host vapool stats" to "host vapool info"
2. Rename "host ram stats" to "host ram info"

Signed-off-by: Anup Patel <anup@brainfault.org>