Patch: Refactor ngx_http_write_request_body into a filter

[grrm grrm]

Hello,

This patch removes some redundant ngx_http_request_body_filter calls,
simplifies the ngx_http_do_read_client_request_body and
ngx_http_read_client_request_body functions and removes some
duplication of code.
body.t and body_chunked.t test in nginx-tests are passing.

Please kindly consider it.

Thank you.
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