Bumped to SNAPSHOT dependencies
 - some dependencies moved to <dependencyManagement>
 - also bumped netty version to 4.0.15 Final (as there was a lot of fixes since 4.0.10 Final)

Signed-off-by: Michal Polkorab <michal.polkorab@pantheon.sk>
Change-Id: Ib636921c0dd099b90f451c44d33ab1d00e4455bb
Merge "Bumped to SNAPSHOT dependencies  - some dependencies moved to <dependencyManagement>  - also bumped netty version to 4.0.15 Final (as there was a lot of fixes since 4.0.10 Final)"