Fix pldmd verbosity command line argument

This commit would attempt to fix the command line argument --verbose.

The fact that verbose option requires an argument 0 or 1 is not
particularly intuitive and a documented OpenBMC anti-pattern.

https://github.com/openbmc/docs/blob/master/anti-patterns.md#non-standard-debug-application-options-and-logging

Resolves : https://github.com/openbmc/pldm/issues/7


Signed-off-by: Manojkiran Eda <manojkiran.eda@gmail.com>
Change-Id: I50d82ce492bd815b589627d3713b1a7fc1db997b