More flexible SSL configuration API

[biran0079]

Today ServerBuilder.useTransportSecurity takes two files as parameter. However, sometimes only InputStreams for the key and cert files are available. Can we add an API to take two input streams?

[ejona86]

We didn't originally because I think tcnative required a File (or we thought it required a File) and we didn't want to save the private key InputStream to a temporary file without the user's knowledge. This may be possible now.

[zpencer]

Looks like it is indeed possible now:
http://netty.io/4.1/api/io/netty/handler/ssl/SslContextBuilder.html#forServer-java.io.InputStream-java.io.InputStream-

[bidossessi]

@zpencer Could I ask why your PR was closed? Is something in the works on this issue?