Update inventory for b200_1 and b200_8 groups (#1136)

Added dgxb200-08 to b200_1 group and removed from b200_8.

A change motivated by pytorch/pytorch#199964


Thanks to @huydhn who pointed me to this inventory list that we are
maintaining.

Author: nWEIdia

multi-tenant/inventory/manual_inventory

@@ -2,6 +2,7 @@
 dgxb200-03 ansible_host=10.184.169.52
 dgxb200-04 ansible_host=10.184.169.53
 dgxb200-05 ansible_host=10.184.169.54
+dgxb200-08 ansible_host=10.184.169.57
 [b200_1:vars]
 num_users=8
 instance_label=linux.dgx.b200
@@ -14,7 +15,6 @@ instance_label=linux.dgx.b200.4
 [b200_8]
 dgxb200-06 ansible_host=10.184.169.55
 dgxb200-07 ansible_host=10.184.169.56
-dgxb200-08 ansible_host=10.184.169.57
 [b200_8:vars]
 num_users=1
 instance_label=linux.dgx.b200.8