[BUG] Wrong Content-Length shared between main request and subrequests in http proxy module

Nginx uses a variable "$proxy_internal_body_length" for the
"Content-Length" header in http proxy module, which is cacheable and shared
between the main request and all subrequests by default.
Although ctx->internal_body_length is calculated for each
request/subrequest, the string format is cached after the first generation,
and this may be wrong for other subrequests.

The following simple config can reproduce the problem, where xxxxx is a
place that can receive post data. curl --data-binary "xxxxxxxxxxxxxxx"
localhost/test.html will cause the client hang.

location = /test.html {
add_after_body /vpost;

proxy_pass http://xxxxx;
}

location /vpost {
proxy_set_body "in vpost";

proxy_pass http://xxxxx;
}
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