align CVX code, FDA and Rxnorm vaccines

[zhengj2007]

Vaccines from 3 systems need to align with each other. For example,

• VO_0010191 influenza, Southern Hemisphere, unspecified formulation (CVX code)
• VO_0010337 AFLURIA SOUTHERN HEMISPHERE vaccine (FDA) (parent: Afluria vaccine, trivalent)
• VO_0020488 Fluzone Quadrivalent 2016 Southern Hemisphere vaccine (RxNorm) (parent: Fluzone Quadrivalent)

VO_0010337 AFLURIA SOUTHERN HEMISPHERE vaccine and VO_0020488 Fluzone Quadrivalent 2016 Southern Hemisphere vaccine might be also subClassOf VO_0010191 influenza, Southern Hemisphere, unspecified formulation