Increase timeouts for SegmentRunner in SegmentRunnerTest.

Test failures were like:
```
Tests run: 5, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 1.531 sec <<< FAILURE! - in io.cassandrareaper.unit.service.SegmentRunnerTest
failureTest(io.cassandrareaper.unit.service.SegmentRunnerTest)  Time elapsed: 1.053 sec  <<< ERROR!
java.util.concurrent.ExecutionException: java.lang.AssertionError: expected:<RUNNING> but was:<NOT_STARTED>
  at io.cassandrareaper.unit.service.SegmentRunnerTest.failureTest(SegmentRunnerTest.java:366)
Caused by: java.lang.AssertionError: expected:<RUNNING> but was:<NOT_STARTED>
```

src/server/src/test/java/io/cassandrareaper/unit/service/SegmentRunnerTest.java

@@ -247,7 +247,7 @@ public JmxProxy connect(final Optional<RepairStatusHandler> handler, String host
         context,
         segmentId,
         Collections.singleton(""),
-        1000,
+        5000,
         0.5,
         RepairParallelism.PARALLEL,
         "reaper",
@@ -354,7 +354,7 @@ public JmxProxy connect(final Optional<RepairStatusHandler> handler, String host
         context,
         segmentId,
         Collections.singleton(""),
-        1000,
+        5000,
         0.5,
         RepairParallelism.PARALLEL,
         "reaper",