RFR: Consistent print_on and tty handling

[Roman Kennke]

Am 30.08.2017 um 21:47 schrieb Aleksey Shipilev:
> http://cr.openjdk.java.net/~shade/shenandoah/tty-fix/webrev.01/
> 
> Need to avoid weird compilation failures: do not mention tty in headers. Also, methods accepting
> outputStream* should be named *_on(outputStream*).
> 
> Testing: hotspot_fast_gc_shenandoah
> 
> Thanks,
> -Aleksey
> 

That seems to fix it. Go!