RFR: 8074895: os::getenv is inadequate

[Jeremy Manson]

Hi, David,

I'd like you to do a code review, please.  Original discussion:

http://mail.openjdk.java.net/pipermail/serviceability-dev/2015-March/016851.html

Per this discussion, I'm just getting rid of the os::getenv interface, and
using straight getenv() everywhere.

Bug:
https://bugs.openjdk.java.net/browse/JDK-8074895

Webrev:
http://cr.openjdk.java.net/~jmanson/8074895/webrev.00/

Jeremy