fix error with trailing slash at the end

[IvanProdaiko94]

To whom it may concern:

if you define the url for schema registry with / in the end, the lib will construct the wrong one.

Example:
schema_registy_host=http://localhost:1234/
will lead to http://localhost:1234//schemas/whatever_next

The lib does strip the / at the end of the string here

but several lines below get the deleted url from config with '/'.

So, with this fix there will be no error if the path of the schema registry will be defined like so:
http://localhost:1234/

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[IvanProdaiko94]

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[rnpridgeon]

🤦‍♂ , good catch. Why not pop the url from the dict up here though

https://github.com/confluentinc/confluent-kafka-python/pull/749/files#diff-c96bedd6523a440fc267c9e78106496bL88

Also please add a unit test that validates the trailing "/" is stripped from the url to avoid future regressions.

[IvanProdaiko94]

@rnpridgeon so, I did what you asked about)

[rnpridgeon]

Thanks for @IvanProdaiko94!