cmd/gaia/app.CollectStdTxs() does not validate delegator address against genesis initial state

[alessio]

The following snippet checks whether the validator address is in the state and if the validator holds enough coins to submit the initial delegation:

		// validate the validator address and funds against the accounts in the state
		msg := msgs[0].(stake.MsgCreateValidator)
		addr := string(sdk.AccAddress(msg.ValidatorAddr))
		acc, ok := addrMap[addr]

		if !ok {
			return appGenTxs, persistentPeers, fmt.Errorf(
				"account %v not in genesis.json: %+v", addr, addrMap)
		}

		if acc.Coins.AmountOf(msg.Delegation.Denom).LT(msg.Delegation.Amount) {
			return appGenTxs, persistentPeers, fmt.Errorf(
				"insufficient fund for delegation %v: %v < %v",
				acc.Address, acc.Coins.AmountOf(msg.Delegation.Denom), msg.Delegation.Amount,
			)
		}

That works with self-delegations. It doesn't work when delegator != validator.
Solution seems to be easy:

1. both delegator and validator addresses must be checked against the state
2. delegation must be validated against delegator's funds

@jackzampolin @cwgoes @zmanian

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