[sr-dev] [kamailio/kamailio] Added msg_get_pv and msg_set_pv to app_python module (#1612)

[David Minh Phan]

These methods allow setting/getting pseudo variable values from Python module.

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#### Description
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Two new methods msg_get_pv and msg_set_pv are added to app_python/python_msgobj.c

In python script, we can call *msg.set_pv* or *msg.get_pv* to set/get value from a pseudo variable

```
class RouteHelper:
    def normalize_number(self, msg, number):
        ret = number
        if number.startswith('00'):
            ret = '+' + number[2:]
        elif number.startswith('0'):
            ret = '+33' + number[1:]

        msg.set_pv("$var(normalized_number)", ret)
        return 1

def mod_init():
    return RouteHelper()
```
You can view, comment on, or merge this pull request online at:

  https://github.com/kamailio/kamailio/pull/1612

-- Commit Summary --

  * app_python: Ability to get/set pseudo variable value from Python module

-- File Changes --

    M src/modules/app_python/python_msgobj.c (92)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/1612.patch
https://github.com/kamailio/kamailio/pull/1612.diff

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