Change function args from *zap.Logger to *interface{}

[depohmel]

Right now lib is forcing a user to use zap logger. It would be better to allow a user to have a choice.

Example:

ibmcloud-storage-volume-lib/provider/utils/init_provider.go

Line 28 in 2218e46

func InitProviders(conf *config.Config, logger *zap.Logger) (registry.Providers, error) {

[arahamad-zz]

good suggestion, we will fix it as an improvement