Make sure get_device_property only reach requested properties

Closes #2908 (closed)

The beacon implementation get_device_property was using a broken matching to check names.

As result this was retrieving more properties than expected.

When a property was also a prefix of another property, the result was even more broken.

This MR fixes the _filter to avoid reaching property names from their prefix (except * was explicitly used).

Plus, trying to also test such get_device_property(..., "toto*"), it looks like this is not a valid tango request. At least pytango is segfaulting in this case. Which make me think using such prefix+wildchar is maybe not a valid API. It would be good check the API specification, and remove prefix+* if it is not supposed to be supported.