[fix] Remote network service: Add request to BMA /network/ws2p/heads

...c/main/java/org/duniter/client/actions/NetworkAction.java

...a/org/duniter/core/client/model/bma/NetworkWs2pHeads.java

...main/java/org/duniter/core/client/model/bma/Ws2pHead.java

...ain/java/org/duniter/core/client/model/bma/Ws2pHeads.java

...g/duniter/core/client/model/bma/jackson/JacksonUtils.java

...r/core/client/model/bma/jackson/Ws2pHeadDeserializer.java

...ter/core/client/model/bma/jackson/Ws2pHeadSerializer.java

.../main/java/org/duniter/core/client/model/local/Peers.java

...duniter/core/client/service/bma/NetworkRemoteService.java

...ter/core/client/service/bma/NetworkRemoteServiceImpl.java

...org/duniter/core/client/service/local/NetworkService.java

...duniter/core/client/service/local/NetworkServiceImpl.java

...ter/core/client/service/bma/NetworkRemoteServiceTest.java