libs: switch to guava 17.0 and bonecp 0.8.0

The bonecp update is only for test server and not used in production.

Target: master
Acked-by: Gerd Behrmann
nfsv4: use guava's Utf8#isWellFormed() to detect bad strings

factor of 10 faster than current implementation.

Target: master
Acked-by: Gerd Behrmann