[sipX-dev] Polycom unit test clean up

["Huijun Yang" <huijun@xxxxxxxxxx>]

Title: Polycom unit test clean up

Hello,

In the process of removing support of firmware 1.6 for Polycom, I found the following files are not used in the unit tests:

- expected-phone-2.0.cfg.xml
- expected-phone-2.1.2.cfg.xml
- expected-phone-2.2.0.cfg.xml
- expected-phone-2.2.2.cfg.xml

- expected-sip-2.0.cfg.xml
- expected-sip-2.1.2.cfg.xml
- expected-sip-2.2.0.cfg.xml
- expected-sip-2.2.2.cfg.xml
- expected-sip-3.0.0.cfg.xml

As for firmware versions beyond 2.0, they all have compatible format, I don't think we need to distinguish the versions anymore, at least at this point. Leaving those unused files only leads to confusion. I am suggesting to remove all those unused test files. Does anyone have objection?

Thanks
Huijun