storaged: storaged_t replace initHealthService with init.

storaged_t has more fields that depend on the health service;
they should be initialized in the new init() function.

Test: storaged unit tests

Change-Id: I70d41e5d0a0ef20c39c41c7539a284937bd21ad5
diff --git a/storaged/main.cpp b/storaged/main.cpp
index c1b1329..b3f1281 100644
--- a/storaged/main.cpp
+++ b/storaged/main.cpp
@@ -51,7 +51,7 @@
 void* storaged_main(void* /* unused */) {
     storaged_sp = new storaged_t();
 
-    storaged_sp->init_health_service();
+    storaged_sp->init();
     storaged_sp->report_storage_info();
 
     LOG_TO(SYSTEM, INFO) << "storaged: Start";