updated to use "-" instead of "_" for multi word variables

vars.tf

@@ -20,7 +20,7 @@ variable "image" {
   default = "CentOS-7-x86_64-GenericCloud-1905"
 }
 
-variable "ohpc_user" {
+variable "ohpc-user" {
   default = "centos"
 }
   
@@ -36,17 +36,17 @@ variable "keypair-name" {
   default = "os-gen-keypair"
 }
 
-variable "ssh_public_key" {
+variable "ssh-public-key" {
   description = "Path to file containing public key"
   default = "~/.ssh/id_rsa.pub"
 }
 
-variable "ssh_private_key" {
+variable "ssh-private-key" {
   description = "Path to file containing private key"
   default =  "~/.ssh/id_rsa"
 }
 
-variable "host_prefix" {
+variable "host-prefix" {
   description = "prefix of host id."
   default = "164.111.161.%s"
 }
@@ -56,7 +56,7 @@ variable "enable-dhcp" {
   default = true
 }
 
-variable "admin_state_up" {
+variable "admin-state-up" {
   description = "whether admin state in enabled. defualt is true"
   default = true
 }