Userspace and kernelspace polishing

[aserdean]

This PR contains the following changes:

• Renaming changes: USER_IN -> CONNECTION_INFO LIST_ENTRY_OUT -> DISK_INFO GET_LIST_OUT -> DISK_INFO_LIST USER_COMMAND -> WNBD_COMMAND Drops the VM (virtual media) part from the prefix IOCTL_WNBDVM.

• Styling: wnbd-client output was off by one tab. Do not print the Status instead return it. Drop the printing of the input parameters when using map command. Drop the prefix when converting the get last error code to string.

• Functional Passing a NULL buffer to the listing IOCTL now returns the needed buffer size. If the buffer size is not enough the user will get an STATUS_BUFFER_OVERFLOW error. Use the driver defined number of targets instead of the <storport.h> one.

[petrutlucian94]

Thanks for addressing those issues!