LLDB Plan - stage I - NetBSD Process Plugin and lldb-server tests

[Kamil Rytarowski <krytarowski%gmail.com@localhost>]

Hello,

My initial goal is to copy the Linux Process Plugin and add minimal
functional support for NetBSD. It will be followed with running and
passing some tests from the lldb-server test-suite.

This is drift from the original plan about porting FreeBSD Process
Plugin to NetBSD, as the FreeBSD one is lacking remote debugging support
and it needs to be redone from scratch.

I'm going to fork wip/lldb-git (as for git snapshot from 16 Dec 2016)
for the purpose of this task to wip/lldb-netbsd and work there.

Next steps after finishing this task is to sync up with Pavel from the
LLDB team after New Year. The NetBSD Process Plugin will be used as a
reference to create new Common Process Plugin shared between Linux and
(Net)BSD.

This work is sponsored by <The NetBSD Foundation>.