HPCC-8080 Correction of command line argument handling

Added check for incorrect number of arguments to command line. (>1)

Corrected output of components on system mentioning .conf instead of .xml

Signed-off-by: Philip Schwartz <philip.schwartz@lexisnexis.com>
Merge pull request #4107 from pschwartz/HPCC-8080-cli-arg-fix

HPCC-8080 Correction of command line argument handling

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>