init: add an initializer for keychord_id_

Add unit test to ensure all POD types of Service are initialized.

Bug: 37855222
Test: Ensure bugreport is triggered via keychord properly.
Test: New unit tests
Merged-In: If2cfea15a74ab417a7b909a60c264cb8eb990de7
Change-Id: If2cfea15a74ab417a7b909a60c264cb8eb990de7
(cherry picked from commit 7da548578c25683fe0082283303e16961df312da)
diff --git a/init/service.cpp b/init/service.cpp
index c20e644..9ba0272 100644
--- a/init/service.cpp
+++ b/init/service.cpp
@@ -160,6 +160,7 @@
       gid_(0),
       namespace_flags_(0),
       seclabel_(""),
+      keychord_id_(0),
       ioprio_class_(IoSchedClass_NONE),
       ioprio_pri_(0),
       priority_(0),
@@ -183,6 +184,7 @@
       capabilities_(capabilities),
       namespace_flags_(namespace_flags),
       seclabel_(seclabel),
+      keychord_id_(0),
       ioprio_class_(IoSchedClass_NONE),
       ioprio_pri_(0),
       priority_(0),