Deprecate old AppScalefile arguments

[tmarballi]

We had changed the following arguments last release and now we want to deprecate the old ones:

• 'n' ==> 'replication'
• 'scp' ==> 'rsync_source'
• 'appengine' ==> 'default_min_appservers'
• 'max_memory' ==> 'default_max_appserver_memory'
• 'min' ==> 'min_machines'
• 'max' ==> 'max_machines'

[tmarballi]

https://ocd.appscale.com:8080/job/Daily%20Build/4724/