Update --help to include newly added command line options

[ndeodhar]

We've added new command line options like --warehouses, --loaderthreads but they don't show up when we run tpccbenchmark --help:

./tpccbenchmark --help
usage: tpccbenchmark
 -c,--config <arg>              [required] Workload configuration file
    --clear <arg>               Clear all records in the database for this
                                benchmark
    --create <arg>              Initialize the database for this benchmark
 -d,--directory <arg>           Base directory for the result files,
                                default is current directory
    --dialects-export <arg>     Export benchmark SQL to a dialects file
    --execute <arg>             Execute the benchmark workload
 -h,--help                      Print this help
    --histograms                Print txn histograms
 -im,--interval-monitor <arg>   Throughput Monitoring Interval in
                                milliseconds
    --load <arg>                Load data using the benchmark's data
                                loader
 -o,--output <arg>              Output file (default System.out)
    --output-raw <arg>          Output raw data
    --output-samples <arg>      Output sample data
    --runscript <arg>           Run an SQL script
 -s,--sample <arg>              Sampling window
 -ss                            Verbose Sampling per Transaction
 -t,--timestamp                 Each result file is prepended with a
                                timestamp for the beginning of the
                                experiment
 -ts,--tracescript <arg>        Script of transactions to execute
    --upload <arg>              Upload the result
    --uploadHash <arg>          git hash to be associated with the upload
 -v,--verbose                   Display Messages

We should update --help to include the new options as well as remove unused options.

[metonymic-smokey]

@ndeodhar
I just ran ./tpccbenchmark --help and I think the flags you mentioned showed up:

I think this issue can be closed?

[metonymic-smokey]

@psudheer21 @hbhanawat
The -s flag mentioned, even though not valid anymore(attempting to use it gave me an error) is used in the Example section of the README.

The name of the file where we specify database credentials is given asconfig/sample_tpcc_config.xml, but config/ has workload_all.xml instead.

I'm not sure these are issues(just started trying to set this up locally) but just dropping them here in any case.