Pass in updated config/app toml direct without needed to write

[czarcas7ic]

Summary

iterceptConfigs

cosmos-sdk/server/util.go

Line 219 in e60b723

func interceptConfigs(rootViper *viper.Viper, customAppTemplate string, customConfig interface{}, tmConfig *tmcfg.Config) (*tmcfg.Config, error) {

I believe we just need to change the logic here to allow configs to be directly overridden here instead of having to write to file at runtime.