VFS-810: Use different UriBuilder for Http4FileSystem

[JanAelb]

There is an issue when parsing urls containing backslashes in Http4FileSystem and derived classes.

https://issues.apache.org/jira/browse/VFS-810

[garydgregory]

-1 as the string in the example "http4://alice\\1234:secret@localhost:80" is not an RFC compliant URI, neither in RFC 2396 or RFC 3986.

The problem is two-fold though, the above, plus the fact that there is a long-standing issue within VFS where we incorrectly handle percent-encoded values.

If in the above you meant to escape the a single \ character then then URL should be "http4://alice%5C1234:secret@localhost:80"; but, that seems to cause problems within VFS, so that's what needs to be fixed.

[JanAelb]

Thank you for the quick response.
Passing "http4://alice%5C1234:secret@localhost:80" is indeed the problem I want to handle. I updated the tests.

[garydgregory]

I have a possible fix in the guts of VFS, stay tuned... This PR is still not the best path IMO because it only deals with a single provider, does not solve the general problem, and adds a dependency on yet another library which happens to be used to test Hadoop.

[JanAelb]

Thank you 👍