snake case json fields in oxapi_demo (#614)

Author: david-crespo

tools/oxapi_demo

@@ -262,7 +262,7 @@ function cmd_instance_create_demo
 	# memory is 1024 * 1024 * 256
 	[[ $# != 3 ]] && usage "expected ORGANIZATION_NAME PROJECT_NAME INSTANCE_NAME"
 	mkjson name="$3" description="an instance called $3" ncpus=1 \
-		memory=268435456 bootDiskSize=1 hostname="$3" |
+		memory=268435456 boot_disk_size=1 hostname="$3" |
 		do_curl "/organizations/$1/projects/$2/instances" -X POST -T -
 }
 
@@ -338,7 +338,7 @@ function cmd_disk_delete
 function cmd_vpc_create_demo
 {
 	[[ $# != 4 ]] && usage "expected ORGANIZATION_NAME PROJECT_NAME VPC_NAME DNS_NAME"
-	mkjson name="$3" dnsName="$4" description="a vpc called $3" |
+	mkjson name="$3" dns_name="$4" description="a vpc called $3" |
 		do_curl "/organizations/$1/projects/$2/vpcs" -X POST -T -
 }