Changelog:
==========
* [fix] os.read/write waits until file descriptor is ready.
* [fix] Upgrade RLocks as last thing we do
* [security] drop header keys with underscores
* [doc] Various doc updates
Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
