Add a sample service for testing init.

I find myself using something like this every time I add functionality
to init. I cannot possibly be the only one doing this. On the other
hand, if this hasn't been added for so long, maybe there's a reason
for that.

The advantage of using a test service versus modifying an existing
service is that the test service doesn't *require* any permissions or
privileges, so you can add and/or remove whatever you need to test
without breaking the service.

I found it useful to have the service check its own /proc/<pid>/status
from command-line arguments, so that's what the service does.

This CL also adds a .clang-format file for init.

Bug: None
Test: Service runs and exits successfully.

Change-Id: I3e7841a7283158e10c0bf55e0103c03902afb1f0
diff --git a/init/.clang-format b/init/.clang-format
new file mode 100644
index 0000000..48d423f
--- /dev/null
+++ b/init/.clang-format
@@ -0,0 +1,14 @@
+---
+Language:        Cpp
+BasedOnStyle:  Google
+BinPackArguments: true
+BinPackParameters: true
+ColumnLimit:     100
+ConstructorInitializerAllOnOneLineOrOnePerLine: false
+IndentWidth:     4
+Standard:        Auto
+TabWidth:        8
+UseTab:          Never
+DerivePointerAlignment: false
+PointerAlignment: Left
+...