ceph: bump to 0.67.2

Signed-off-by: Marc-Antoine Perennou <keruspe@exherbo.org>
glusterfs: bump to 3.4.0

Signed-off-by: Marc-Antoine Perennou <keruspe@exherbo.org>
rabbitmq-server: bump to 3.1.5

Signed-off-by: Marc-Antoine Perennou <keruspe@exherbo.org>
leveldb: bump to 1.13.0

Signed-off-by: Marc-Antoine Perennou <keruspe@exherbo.org>
libcouchbase: bump to 2.1.1

Signed-off-by: Marc-Antoine Perennou <keruspe@exherbo.org>
redis: bump to 2.6.15

Signed-off-by: Marc-Antoine Perennou <keruspe@exherbo.org>