libfsid(3): Make the filesystem type an enum and perform misc cleanup.

libfsid - A new library to determine filesystems.

* The idea is extracted from the sbin/fsid tool. The library provides an
interface to probe a given device for a file system and get its volume

libfsid - A new library to determine filesystems.

* The idea is extracted from the sbin/fsid tool. The library provides an
interface to probe a given device for a file system and get its volume
label.

* fsid was changed to use libfsid functionality.

Sponsored-by: Google Code-In

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