As an Admin, I can define FTP servers to be used on Workflow Post functions

A new Add-on Administration menu should be created, called as "Servers".
In this Screen should be shown a list of all Servers Configured. The list should show:

• Server Name
• Server Type (FTP for now but we can allow other in a near future.)
• Authentication
• Created date
• Last update date
• Actions:
• * Edit
• * Delete
• *Set as Default

The default should be pre selected on the workflow post function.

Add new Server
As it was made in other screens an option to add new server should be added to this screen.
Fields:

• Server Name (Required and should be unique)
• Port (Required)
• Authentication (Optional)

Edit Server
Editable fields:

• Server Name (Required and should be unique)
• Port (Required)
• Authentication (Optional)