Add John as Maintainer

Add myself as a maintainer and add a change approval rule:

wait for 24 hours before doing the final submit, after +2 on a commit

Signed-off-by: John Wang <wangzqbj@inspur.com>
Change-Id: I3a1fee8df31d5b24c8a44f1f1a2ccabf6b0dc756
diff --git a/MAINTAINERS b/MAINTAINERS
index f403164..37c5bdd 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -50,6 +50,8 @@
     - Patches should include unit tests where possible.
     - Feel free to ping on IRC about patches that look good but have not
       received +2
+    - Wait 24 hours before doing the final submit after doing a +2 on a
+      commit and any maintainer can do the final submit
 
 Design approval rules:
 
@@ -62,3 +64,4 @@
 
 M:  Deepak Kodihalli <dkodihal@linux.vnet.ibm.com> <dkodihal!>
 M:  Tom Joseph <tomjose@linux.vnet.ibm.com> <tomjose>
+M:  John Wang <wangzqbj@inspur.com> <JohnWang!>