[TODO] UpgradePlanEventHolder init

[jolestar]

starcoin-framework/sources/PackageTxnManager.move

Lines 271 to 281 in e82c1d3

	// TODO
	// if UpgradePlanCapability was delegated to DAO or contract,
	// it's hard to upgrade the address to claim an UpgradePlanEventHolder.
	// Try to fix this!
	if (exists<UpgradePlanEventHolder>(package_address)) {
	let event_holder = borrow_global_mut<UpgradePlanEventHolder>(package_address);
	Event::emit_event<UpgradePlanEvent>(&mut event_holder.upgrade_plan_event, UpgradePlanEvent {
	package_address,
	plan
	});
	}

[pause125]

I've tried the following way:

1. In Account module, add a friend function to get a signer from address: public(friend) fun get_signer_of(account: address)
2. Create a new script function in a new file PackageTxnManagerUpgrade.move for DAO to invoke, here is the commit

This may be a feasiable way, but the DAO has to upgrade contract.