[OpenSIPS-Devel] [OpenSIPS/opensips] a7a05c: Fix missing escaping in JSON output via mi_json

[Bogdan Andrei IANCU]

  Branch: refs/heads/2.2
  Home:   https://github.com/OpenSIPS/opensips
  Commit: a7a05c9aa0672ab99364a2f9806bffe8be225533
      https://github.com/OpenSIPS/opensips/commit/a7a05c9aa0672ab99364a2f9806bffe8be225533
  Author: Bogdan-Andrei Iancu <bogdan at opensips.org>
  Date:   2019-04-08 (Mon, 08 Apr 2019)

  Changed paths:
    M modules/mi_json/http_fnc.c

  Log Message:
  -----------
  Fix missing escaping in JSON output via mi_json

TAB, Back Space, Form Feed, New Line and Carriage Return must be escaped in the values returned by mi_json.

(cherry picked from commit d0156db0a0c09353864f7600b948ed5e4177ab9e)