aiohttp migration fixes

[bdraco]

• We should let the exception raise up as that is what downstream expects
• Make sure we properly cleanup the connector/session
• fixed close property to work for aiohttp

[codecov]

Codecov Report

Attention: Patch coverage is 40.00000% with 3 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
onvif/client.py	50.00%	2 Missing ⚠️
onvif/managers.py	0.00%	1 Missing ⚠️

Files with missing lines	Coverage Δ
onvif/zeep_aiohttp.py	97.84% <ø> (+1.84%)	⬆️
onvif/managers.py	32.27% <0.00%> (ø)
onvif/client.py	65.66% <50.00%> (-0.36%)	⬇️

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