Consider reinstating tags-as-metadata option

[spencergibb]

See #696 and #698. Please vote using the reaction feature of THIS comment.

[spencergibb]

@lucasoares PR?

[lucasoares]

@spencergibb I can make it.. I just forked to be able to fix my problem as fast as possible and after that I had no time to do it.

I will have to change the default value to false right?

[spencergibb]

@lucasoares yes, default to false.

[lucasoares]

Please validate my solution and inform me any remaining changes I need to do: #700

Thanks.

[HaojunRen]

That means spring.cloud.consul.discovery.metadata.version=1.0 and spring.cloud.consul.discovery.tags=version=1.0 are all supported?