Update crate uuid to 1.1.2

[dubek]

Use the latest version of the uuid crate, and modify simple-kbs code accordingly:

• Use as_hyphenated() instead of to_hyphenated()
• Use the new to_bytes_le() instead of our own implementation
• Use compile-time uuid! macro to define SECRET_GUID

Signed-off-by: Dov Murik dov.murik1@il.ibm.com

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I tested this by slowly replacing the implementations (first in the unit-tests, then in the body, then in both), while verifying the unit-tests keep passing. This ensures the new implementations are byte-by-byte identical to the old one.