RFR: 8159855: Create an SPI for tools

[Mandy Chung]

> On Oct 7, 2016, at 2:40 PM, Jonathan Gibbons <jonathan.gibbons at oracle.com> wrote:
> 
> Updated webrev with feedback from comments:
> 
> * use doPrivileged within ToolProvider.findFIrst  (includes adding new test)
> * improve whitespace in doc comments
> 
> Webrev: http://cr.openjdk.java.net/~jjg/8159855/webrev.05/

Looks good.  Thanks for adding the new test.

Nit: line 68: s/nonzero/non-zero

Mandy