[hotfix] Remove RecoveryMode from JobMaster

The recovery mode is not used any more by the latest CheckpointCoordinator.

All difference in recovery logic between high-availability and non-high-availability
is encapsulated in the HighAvailabilityServices.

flink-runtime/src/main/java/org/apache/flink/runtime/rpc/jobmaster/JobMaster.java

@@ -22,7 +22,6 @@
 import org.apache.flink.configuration.Configuration;
 import org.apache.flink.runtime.highavailability.HighAvailabilityServices;
 import org.apache.flink.runtime.jobgraph.JobGraph;
-import org.apache.flink.runtime.jobmanager.RecoveryMode;
 import org.apache.flink.runtime.leaderelection.LeaderContender;
 import org.apache.flink.runtime.leaderelection.LeaderElectionService;
 import org.apache.flink.runtime.messages.Acknowledge;
@@ -57,7 +56,6 @@ public class JobMaster extends RpcEndpoint<JobMasterGateway> {
 
 	/** Configuration of the job */
 	private final Configuration configuration;
-	private final RecoveryMode recoveryMode;
 
 	/** Service to contend for and retrieve the leadership of JM and RM */
 	private final HighAvailabilityServices highAvailabilityServices;
@@ -86,7 +84,6 @@ public JobMaster(
 		this.jobID = Preconditions.checkNotNull(jobGraph.getJobID());
 
 		this.configuration = Preconditions.checkNotNull(configuration);
-		this.recoveryMode = RecoveryMode.fromConfig(configuration);
 
 		this.highAvailabilityServices = Preconditions.checkNotNull(highAvailabilityService);
 	}