STORM-1845: use UTF-8 instead of default encoding

[vesense]

No description provided.

[darionyaphet]

Hi @vesense If I don't specified charset which one will be used ?

[vesense]

default: lookupCharset(System.getProperty("file.encoding")) == null ? "UTF-8" : System.getProperty("file.encoding")

[hmcl]

@vesense what is the motivation behind this change? Prior to your proposed change, the charset used is the one that is defined by the java system property file.encoding. If this property is absent the file encoding used will be UTF-8 by default, in JDK8.

My understanding is that your proposed change will eliminate the chance to customize an arbitrary charset using file.encoding. Is that the goal?

If the goal is to set UTF-8 by default, perhaps one should set in a configuration file, or even in the CLI scripts the property to file.encoding=UTF-8 if the property is not specified. Something along the lines `System.getProperty("file.encoding", "UTF-8")