Prepare v2017.05-rc3

Signed-off-by: Tom Rini <trini@konsulko.com>

Makefile

diff --git a/Makefile b/Makefile
index 131d62e..b8816ad 100644
--- a/Makefile
+++ b/Makefile
@@ -5,7 +5,7 @@
 VERSION = 2017
 PATCHLEVEL = 05
 SUBLEVEL =
-EXTRAVERSION = -rc2
+EXTRAVERSION = -rc3
 NAME =
 
 # *DOCUMENTATION*