Make wsdl_dir path resolving more robust

[mweinelt]

Relying on importlib to resolve the path to the wsdl directory is more robust, since it traverses all site-packages directories, that are part of the PYTHONPATH.

>>> from importlib.util import find_spec
>>> from pathlib import Path
>>> Path(find_spec("onvif").origin).parent / "../wsdl"
PosixPath('/nix/store/awkcfajc6a0frwhvzib4pmmx0awa4bgj-python3-3.11.8-env/lib/python3.11/site-packages/onvif/../wsdl')

The ONVIFCamera object passes wsdl_dir into os.path.join, which accepts path-like objects since Python 3.6.

https://github.com/quatanium/python-onvif/blob/09ffc65b8cd9d141b6a386804e7af7028755034e/onvif/client.py#L343
https://docs.python.org/3/library/os.path.html#os.path.join

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[NickM-27]

in testing this doesn't seem to work

Onvif connection to office_cam failed: Unknown error: No such file: /usr/local/lib/python3.9/dist-packages/onvif/../wsdl/devicemgmt.wsdl

[NickM-27]

it should be finding site-packages but it is keying in to dist-packages

edit: addressed in #10998

[mweinelt]

Where does an onvif-zeep dist-package come from in the first place? AIUI dist-packages is a Debianism, and there is no python3-onvif-zeep Debian package.

[NickM-27]

it isn't, it is installed via pip and the wsdl is only saved in site packages.