Civicampaign petition includes all states for all enabled countries instead of just states for selected country

The code in CRM/Campaign/Form/Petition/Signature.php is incomplete and lacks the special handling for country/state. In particular, the function buildCustom needs the statecountrymap code as found in other forms, such as the events forms. Also the function setDefaultValues needs a call to fixAllStateSelects after the defaults are filled in. I have made changes to my test platform, and have it working properly. I will be testing it and when I am satisfied I wouid like to submit the changes.