Roll-up of threading changes

Support grpclb address in the c-ares resolver 

Signed-off-by: Chris Aniszczyk <caniszczyk@gmail.com>

Signed-off-by: Chris Aniszczyk <caniszczyk@gmail.com>

Split Up Microbenchmark by Individual Benchmark

Patents already part of Apache2 license

Remove extraneous semicolons.

Changing license to Apache v2

Rendering aborted due to complexity issues. If this is valid markdown, please feel free to open an issue and attach the original markdown to the issue.

Get rid of zero-length poll case now that timer pool exists

Update comments to discourage having an OK status with error_message