Do not wrap Guava as a bundle in features' definition

As it will refresh the bundle when the feature is loaded,
because it will certainly be already installed, and hence
will refresh all bundles depending on Guava.

Also, this is not necessary.

This patch is not directly tied to BUG-6956 but it's a result of it

Change-Id: I79a3adac4dd8d21757f8c7756b0239413ee55589
Signed-off-by: Alexis de Talhouët <adetalhouet@inocybe.com>