[enh] Network scan: create an HttpClient by thread, when refreshing peers

...ter4j-client/src/main/filtered-resources/log4j.properties

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

...src/main/resources/i18n/duniter4j-client_en_GB.properties

...src/main/resources/i18n/duniter4j-client_fr_FR.properties

...va/org/duniter/core/client/model/bma/BlockchainBlock.java

...java/org/duniter/core/client/service/HttpServiceImpl.java

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

...n/java/org/duniter/core/client/util/http/HttpClients.java

duniter4j-core-client/src/main/resources/log4j.properties

pom.xml