prefix all java samples

[octonato]

This prefix all existing samples with java- in preparation for the upcoming Scala SDK as we will start to write samples for Scala as well.

I left the valueentity-counter out because it's already done in #373

[octonato]

It seems that two of the three replicated entity samples are not used in the docs. There is no link to shopping-cart nor to the counter sample.

Should we remove them to reduce the number of samples to support?

[patriknw]

LGTM

[patriknw]

this will probably require an update to the download link from the quickstart adoc page

[octonato]

Good catch.
Done in https://github.com/lightbend/akkaserverless-docs/pull/920

[pvlugter]

It seems that two of the three replicated entity samples are not used in the docs. There is no link to shopping-cart nor to the counter sample.

I added java-replicatedentity-shopping-cart and java-replicatedentity-examples for the docs, and they should both be used there. The counter sample is redundant given the new examples for all the replicated data types, and I think that can be removed.

[octonato]

@pvlugter, I may be wrong, but I didn't find any references to replicatedentity-shopping-cart in the docs.

[octonato]

Oh, my bad. Checked one again and it's indeed used in replicated-entity-crdt.adoc. I will PR to remove the counter one.