[hotfix] [build] Small improvements to the flink-mesos build

  - The newer akka versions have no protobuf dependency and need no exclusion any more
  - The transitive dependency promotion is ineffective here, disabling it makes
    it more robust against accidentally pulling in more dependencies in the future
  - Properly specifying the shaded dependencies is safer

flink-mesos/pom.xml

@@ -71,13 +71,6 @@ under the License.
  <groupId>com.typesafe.akka</groupId>
  <artifactId>akka-remote_${scala.binary.version}</artifactId>
  <scope>provided</scope>
- <exclusions>
- <!-- exclude the lower/wrong version of Protobuf here -->
- <exclusion>
- <groupId>com.google.protobuf</groupId>
- <artifactId>protobuf-java</artifactId>
- </exclusion>
- </exclusions>
  </dependency>
 
  <dependency>
@@ -269,9 +262,7 @@ under the License.
  </configuration>
  </plugin>
 
- <!-- Relocate Mesos Protobuf dependency. Mesos 1.0.1 requires Protobuf 2.6.1 whereas
- Flakka pulls in Protobuf 2.5.0. It might be feasible to set Protobuf to version 2.6.1,
- but we shade to be on the safe side. -->
+ <!-- Relocate Mesos Protobuf dependency. -->
  <plugin>
  <groupId>org.apache.maven.plugins</groupId>
  <artifactId>maven-shade-plugin</artifactId>
@@ -283,11 +274,10 @@ under the License.
  <goal>shade</goal>
  </goals>
  <configuration>
- <promoteTransitiveDependencies>true</promoteTransitiveDependencies>
  <artifactSet>
  <includes combine.children="append">
- <include>com.google.protobuf:*</include>
- <include>org.apache.mesos:*</include>
+ <include>com.google.protobuf:protobuf-java</include>
+ <include>org.apache.mesos:mesos</include>
  </includes>
  </artifactSet>
  <relocations combine.children="append">