Add static Process class and improved dump output

Test: as follows
    - built, flashed, booted
    - adb shell dumpsys netd shows new output
Change-Id: Ib78dbdc982f5db747bff445db21b8408c9c407cc
diff --git a/libnetdutils/include/netdutils/Misc.h b/libnetdutils/include/netdutils/Misc.h
index 41f5778..b523816 100644
--- a/libnetdutils/include/netdutils/Misc.h
+++ b/libnetdutils/include/netdutils/Misc.h
@@ -38,11 +38,12 @@
   public:
     Cleanup() = delete;
     Cleanup(FnT fn) : mFn(fn) {}
-    ~Cleanup() { mFn(); }
+    ~Cleanup() { if (!mReleased) mFn(); }
 
-    void release() { mFn = {}; }
+    void release() { mReleased = true; }
 
   private:
+    bool mReleased{false};
     FnT mFn;
 };