Updates Google Cluster Reader classes to

deal with timestamp values as double.
This way, if such values are changed during pre-processing
phase so that the result value is larger than an int,
they will be read as double to avoid overflow.

Since such values are converted from microseconds (the unit in trace files)
to seconds (the unit used by CloudSim Plus), the final result is double
anyway.

Signed-off-by: Manoel Campos <manoelcampos@gmail.com>

cloudsim-plus/src/main/java/org/cloudsimplus/traces/google/GoogleTaskEventsTraceReader.java

@@ -114,7 +114,7 @@ public enum FieldIndex implements TraceField<GoogleTaskEventsTraceReader> {
              */
             @Override
             public Double getValue(final GoogleTaskEventsTraceReader reader) {
-                return Conversion.microToSeconds(reader.getFieldIntValue(this));
+                return Conversion.microToSeconds(reader.getFieldDoubleValue(this));
             }
         },
 
@@ -400,7 +400,7 @@ public Set<Cloudlet> process() {
     }
 
     /**
-     * There is not pre-process for this implementation.
+     * There is no pre-process requirements for this implementation.
      */
     @Override
     protected void preProcess(){/**/}

cloudsim-plus/src/main/java/org/cloudsimplus/traces/google/GoogleTaskUsageTraceReader.java

@@ -84,7 +84,7 @@ public enum FieldIndex implements TraceField<GoogleTaskUsageTraceReader> {
              */
             @Override
             public Double getValue(final GoogleTaskUsageTraceReader reader) {
-                return Conversion.microToSeconds(reader.getFieldIntValue(this));
+                return Conversion.microToSeconds(reader.getFieldDoubleValue(this));
             }
         },
 
@@ -100,7 +100,7 @@ public Double getValue(final GoogleTaskUsageTraceReader reader) {
              */
             @Override
             public Double getValue(final GoogleTaskUsageTraceReader reader) {
-                return Conversion.microToSeconds(reader.getFieldIntValue(this));
+                return Conversion.microToSeconds(reader.getFieldDoubleValue(this));
             }
         },