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httpc: allow only strings for opts.headers values

There are two reasons to disable support of tables with __tostring
metamethods as opts.headers values:

* It seems this feature is not much needed: a type convertion can be
  easily done on a user's end with explicit tostring() call if needed.
* It never did work since introduction in 2.1.1-311-g85e1d78bc ('httpc:
  add checking of headers in httpc:request'): __tostring presence was
  verified, but a function in the field was not invoked.

Now http client accepts only a Lua string as a header key or a value.

Closes #3679 (again).

(cherry picked from commit 28e688294)

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