Use the name of the StoreType to do hashcode

[sswguo]

The following logs are from stage, which shows two transfers with the same uri and path but different hashcode, that causes the duplicated download jobs for the same transfer, let's use the name of StoreType to do hashcode instead.

Transfer uri: https://repository.engineering.redhat.com/nexus/repository/registry.npmjs.org/
Transfer path: glob/-/glob-7.1.6.tgz
Transfer hashCode: 1913094049
----------------
Transfer uri: https://repository.engineering.redhat.com/nexus/repository/registry.npmjs.org/
Transfer path: glob/-/glob-7.1.6.tgz
Transfer hashCode: 159836173

[ruhan1]

type is enum. its hashcode should be the object id. this id won't change in the lifetime of a jvm. but type.name is a better idea.

[sswguo]

type is enum. its hashcode should be the object id. this id won't change in the lifetime of a jvm. but type.name is a better idea.

It looks it uses the hashcode of Object, but it should not change in the same JVM, I will have a test with this. thanks.