Update AS21902-series standards based on the AS21900 model. Part standards involved are: AS21902, AS21904, AS21905, AS21906, AS21907, AS21908, AS21909, AS21910, AS21911, AS21912, AS21913, AS21914, AS21915, AS21916, AS21917, AS21921, AS21922, AS21924, AS21925, AS21926