Rename config options ('duniter.p2p.enable' and 'duniter.stats.enable')

...4j-es-assembly/src/main/assembly/config/elasticsearch.yml

...r4j-es-assembly/src/test/es-home/config/elasticsearch.yml

...e/src/main/java/org/duniter/elasticsearch/PluginInit.java

...c/main/java/org/duniter/elasticsearch/PluginSettings.java

...sticsearch/service/AbstractBlockchainListenerService.java

...va/org/duniter/elasticsearch/subscription/PluginInit.java

...rg/duniter/elasticsearch/subscription/PluginSettings.java

.../main/java/org/duniter/elasticsearch/user/PluginInit.java

...n/java/org/duniter/elasticsearch/user/PluginSettings.java