[DESIGN] Use per-request authentication and persistent connections between S3g and OM

[Elek, Marton]

TLDR;

Today S3g uses the same OM Client protocol what client uses.

I suggest to create a new method where we can improve performance with 
per-request auth token check (same request/response pairs but on GRPC 
with an additional token info).

As a result we can re-use OzoneClient instances instead of creating them 
for each HTTP request.

Details:

https://github.com/apache/ozone/pull/1562/files?short_path=a5102d5#diff-a5102d54ddde1aa3ec99960791fb1ae6b6948b4ebaa1571488823bed8ebee12a


Any feedback is welcome...

Thanks,
Marton

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