[GSoC]pull request: POSIX Key project

[Ashi]

Hi, all. Here is my first pull request:
https://github.com/RTEMS/rtems/pull/3
this is the POSIX Key manager's one rbtree implementation, and also with
added 7 test cases.
Many thanks to any comment and review!
-- 
Best wishes!
Zhongwei Yao
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