Remove test cases that are no longer valid with go 1.17

[jawn-smith]

As of go 1.17, the net/http and net/url packages no longer accept ';' as a valid separator. See https://golang.org/doc/go1.17#semicolons for more information.

In order to build this package with go 1.17 and keep it in Ubuntu, the test cases that use ';' as a separator should be removed.

[jawn-smith]

Actually, perhaps I should just change the ';' characters to '&' which is still a valid separator. Do the devs here have an opinion?

[jawn-smith]

Actually, perhaps I should just change the ';' characters to '&' which is still a valid separator. Do the devs here have an opinion?

I went with this as it's a much smaller change that doesn't remove any test coverage.