Update and alphabetize OWNERS.

Test: n/a
Change-Id: I7d63c09fb28fb3739f051bcda6c852d971413aa5
diff --git a/OWNERS b/OWNERS
index fe15e48..9a51b01 100644
--- a/OWNERS
+++ b/OWNERS
@@ -1,5 +1,6 @@
 ghartman@google.com
-jemoreira@google.com
-pinghao@google.com
 haining@google.com
+jemoreira@google.com
 malchev@google.com
+muntsinger@google.com
+schuffelen@google.com