put variables in alphabetical order

vars.tf

-variable "ohpc-instance-name" {
-  default = "ohpc"
-}
-
-variable "internal-net" {
-  default = "clusternet"
+variable "admin-state-up" {
+  description = "whether admin state in enabled. defualt is true"
+  default = true
 }
 
-variable "internal-subnet" {
-  default = "clustersubnet"
+variable "enable-dhcp" {
+  description = "whether dhcp in enabled. defualt is true"
+  default = true
 }
 
 variable "external-net" {
@@ -18,52 +16,53 @@ variable "external-subnet" {
   default = "dmzsubnet"
 }
 
-variable "router" {
-  default = "borderrouter"
+variable "flavor" {
+  default = "m1.medium"
 }
 
-variable "image" {
-  default = "CentOS-7-x86_64-GenericCloud-1905"
+variable "host-prefix" {
+  description = "prefix of host id."
+  default = "164.111.161.%s"
 }
 
-variable "ohpc-user" {
-  default = "centos"
+variable "internal-net" {
+  default = "clusternet"
 }
-  
-variable "flavor" {
-  default = "m1.medium"
+
+variable "internal-subnet" {
+  default = "clustersubnet"
 }
 
-variable "public-network-name" {
-  default = "bright-external-flat-externalnet"
+variable "image" {
+  default = "CentOS-7-x86_64-GenericCloud-1905"
 }
 
 variable "keypair-name" {
   default = "os-gen-keypair"
 }
-
-variable "ssh-public-key" {
-  description = "Path to file containing public key"
-  default = "~/.ssh/id_rsa.pub"
+  
+variable "ohpc-instance-name" {
+  default = "ohpc"
 }
 
-variable "ssh-private-key" {
-  description = "Path to file containing private key"
-  default =  "~/.ssh/id_rsa"
+variable "ohpc-user" {
+  default = "centos"
 }
 
-variable "host-prefix" {
-  description = "prefix of host id."
-  default = "164.111.161.%s"
+variable "public-network-name" {
+  default = "bright-external-flat-externalnet"
 }
 
-variable "enable-dhcp" {
-  description = "whether dhcp in enabled. defualt is true"
-  default = true
+variable "router" {
+  default = "borderrouter"
 }
 
-variable "admin-state-up" {
-  description = "whether admin state in enabled. defualt is true"
-  default = true
+variable "ssh-private-key" {
+  description = "Path to file containing private key"
+  default =  "~/.ssh/id_rsa"
 }
 
+variable "ssh-public-key" {
+  description = "Path to file containing public key"
+  default = "~/.ssh/id_rsa.pub"
+}
\ No newline at end of file