RFR: 8155039: Simplify code to setup SSLContextImpl and TrustManagerFactoryImpl

[Claes Redestad]

Hi,

SSLContextImpl and TrustManagerFactoryImpl has some setup code that 
could be
simplified, getting rid of a couple of anonymous classes in the process.

Webrev: http://cr.openjdk.java.net/~redestad/8155039/webrev.00
Bug: https://bugs.openjdk.java.net/browse/JDK-8155039

Alternatively we could remove OpenFileInputStreamAction instead since 
these two uses
introduced here are actually the only active uses of this old 
convenience class.

Thanks!

/Claes