test/osd: Added support for new plugins

test/osd: Added support for new plugins

Added new command line options for specifying plugins along with optional readers for them. Added arguments to JSON structures for some optional arguments to encode and decode more information about profiles. Added more choices for random selections of different plugin values and changed structure so profiles are created as part of a pool specifically, encapsulating them.

    Signed-off-by: Jon Bailey <jonathan.bailey1@ibm.com>