Refactor TestParseURL
Refactor TestParseURL

This is in preparation for supporting query parameters
in ParseURL:

- use an expected *Options instance to execute assertions on
- extract assertions into helper function
- enable parallel testing
- condense test table

go-redis/redis,vmihailenco/redis,HatsuneMiku3939/redis,HatsuneMiku3939/redis,HatsuneMiku3939/redis,go-redis/redis,HatsuneMiku3939/redis