bento-cluster: EXP-420. Update to scala 2.10

issue: https://jira.kiji.org/browse/EXP-420
review: https://review.kiji.org/r/1689
commit: https://github.com/kijiproject/bento-cluster/commit/b99ac56047ef0948609fd6cec114ea15b49ce614
fake-hbase: EXP-420. Update to scala 2.10

issue: https://jira.kiji.org/browse/EXP-420
review: https://review.kiji.org/r/1690
commit: https://github.com/kijiproject/fake-hbase/commit/fb034becb502361bb32b1dfffb7084e59d914f60