Report driver memory statistics with QuboleJobListener

[mayurdb]

Following metrics related to the Driver are now reported -

1. driverHeapMax => Max Heap memory allocated to the driver JVM
2. driverMaxHeapCommitted => Max Heap memory committed to the driver JVM
3. driverMaxHeapUsed => Max Heap memory used by the driver JVM
4. driverCPUTime => Total CPU Time allocated to the driver JVM
5. driverGCCount => Total major GCs happened during the lifetime of the JVM
6. driverGCTime => Part of driverCPUTime spent in the GC

Sample output for a simple application.

 Time spent in Driver vs Executors
 Driver WallClock Time    00m 11s   79.24%
 Executor WallClock Time  00m 03s   20.76%
 Total WallClock Time     00m 15s


 DriverMetrics (driverMetrics)
                NAME                        Value
 driverCPUTime                           10216.7 hh
 driverGCCount                                   11
 driverGCTime                              301.0 ms
 driverHeapMax                               1.0 GB
 driverMaxHeapCommitted                    480.0 MB
 driverMaxHeapUsed                         308.9 MB