Change makeksnet from yaml to json

Older vmware did just json, which is fine, just have to use
the json file that was there just in case something like this
came up.

confluent_osdeploy/esxi7/profiles/hypervisor/scripts/makeksnet

@@ -1,7 +1,7 @@
 #!/usr/bin/python
 import re
 import subprocess
-import yaml
+import json
 uplinkmatch = re.compile('^\s*Uplinks:\s*(.*)')
 nodename = None
 for inf in open('/etc/confluent/confluent.info', 'r').read().split('\n'):
@@ -34,8 +34,8 @@ for info in vswinfo.split('\n'):
     if upinfo:
         vmnic = upinfo.group(1)
 try:
-    with open('/tmp/confluentident/cnflnt.yml') as identin:
-        identcfg = yaml.safe_load(identin)
+    with open('/tmp/confluentident/cnflnt.jsn') as identin:
+        identcfg = json.load(identin)
         ncfg = identcfg['net_cfgs'][0]
         cfg['ipv4_method'] = ncfg['ipv4_method']
         cfg['ipv4_address'] = ncfg['ipv4_address'].split('/')[0]
@@ -52,4 +52,4 @@ if cfg['ipv4_method'] == 'static':
         netline += ' --gateway={0}'.format(cfg['ipv4_gateway'])
     if cfg['nameservers']:
         netline += ' --nameserver={0}'.format(cfg['nameservers'])
-print(netline)
+print(netline)