Refactoring maas functions to use config

Use config instead of args.
Adding
* process_fabrics
* process_subnets
* process_devices
* process_machines
* process_dhcp_snippets
* process_boot_resources
* process_package_repositories
diff --git a/_modules/apiclient/multipart.py b/_modules/apiclient/multipart.py
index f6c5ce8..7ed17a6 100644
--- a/_modules/apiclient/multipart.py
+++ b/_modules/apiclient/multipart.py
@@ -56,6 +56,8 @@
 
 
 def make_file_payload(name, content):
+    print('********************************')
+    print('content %s' % content)
     payload = MIMEApplication(content.read())
     payload.add_header(
         "Content-Disposition", "form-data", name=name, filename=name)