HttpFS / WebHDFS support

[Antwnis]

Sometimes we want to operate over remote hadoop clusters. That can be achieved - through REST calls to HttpFS / WebHDFS.

The only difference between the 2 services above - is that i) they listen on different ports ii) HttpFS is minimizing the footprint required to access HDFS, as a single node acts as a "gateway" where WebHDFS requires access to all nodes of the cluster

Introduce capabilities over functionalities:

File and Directory Operations
Create and Write to a File
Append to a File
Open and Read a File
Make a Directory
Rename a File/Directory
Delete a File/Directory
Status of a File/Directory
List a Directory

Other File System Operations
Get Content Summary of a Directory
Get File Checksum
Get Home Directory
Set Permission
Set Owner
Set Replication Factor
Set Access or Modification Time

[sksamuel]

We could add a remote component but the perf would be terrible?