Fix build error, due to changes in FlowId: https://git.opendaylight.org/gerrit/#/c/4058/

Changes to fix build were based on changes done in commit 45b75a6ba76bf8b453b5f0de11ceb0c3bba1e842, file:
.../opendaylight/md-sal/statistics-manager/src/main/java/org/opendaylight/controller/md/statistics/manager/StatisticsUpdateCommiter.java

Change-Id: I635c7530cd9897d7c0ee8f1cb5209869c90f24b5
Signed-off-by: Flavio Fernandes <ff@member.org>
<WIP> Refactoring agnostic ConfigurationService

Change-Id: Ib542f9cb556cb5b4096fefb17186cad0b40afc40
Signed-off-by: Galo Navarro <galo@midokura.com>