[ruby-core:83423] [Ruby trunk Bug#14035] URI module file representation does not conform to the standard

Issue #14035 has been reported by ioggstream (Roberto Polli).

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Bug #14035: URI module file representation does not conform to the standard
https://bugs.ruby-lang.org/issues/14035

* Author: ioggstream (Roberto Polli)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.4.2p198 (2017-09-14 revision 59899) [x86_64-linux]
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN
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### Reproduce

execute URI("file:///etc/hosts").to_s 


### I expect

  - URI("file:///etc/hosts").to_s == "file:///etc/hosts"

  - URI to represent file:// paths in canonical form (Eg. see "file:///etc/hosts" in https://tools.ietf.org/html/rfc3986#section-1.1)

### Instead 

  - URI("file:///etc/hosts").to_s == "file:/etc/hosts"

  - URI("file:///etc/hosts").host == nil

### Fix for Ruby 2.4

Adopting the convention

  - file schema to have a blank/empty "" host  

suggested in rfc3986 will fix the issue.

```
   If the URI scheme defines a default for host, then that default
   applies when the host subcomponent is undefined or when the
   registered name is empty (zero length).  For example, the "file" URI
   scheme is defined so that no authority, an empty host, and
   "localhost" all mean the end-user's machine, whereas the "http"
   scheme considers a missing authority or empty host invalid.
```
 

This is a proposed implementation.

```
require 'uri/generic'

module URI
  class FILE < Generic
    def initialize(*args)
      super(*args)
      @host = "" if @host.nil?
    end
  end
  @@schemes['FILE'] = FILE
end
```



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