Merge "Update init documentation to reflect fs_config changes"

init/readme.txt

@@ -109,9 +109,16 @@ socket <name> <type> <perm> [ <user> [ <group> [ <seclabel> ] ] ]
 user <username>
   Change to username before exec'ing this service.
   Currently defaults to root.  (??? probably should default to nobody)
-  Currently, if your process requires linux capabilities then you cannot use
-  this command. You must instead request the capabilities in-process while
-  still root, and then drop to your desired uid.
+  As of Android M, processes should use this option even if they
+  require linux capabilities.  Previously, to acquire linux
+  capabilities, a process would need to run as root, request the
+  capabilities, then drop to its desired uid.  There is a new
+  mechanism through fs_config that allows device manufacturers to add
+  linux capabilities to specific binaries on a file system that should
+  be used instead. This mechanism is described on
+  http://source.android.com/devices/tech/config/filesystem.html.  When
+  using this new mechanism, processes can use the user option to
+  select their desired uid without ever running as root.
 
 group <groupname> [ <groupname> ]*
   Change to groupname before exec'ing this service.  Additional