bump version to 17.11.0-ce-rc2

Signed-off-by: Eli Uriegas <eli.uriegas@docker.com>
diff --git a/VERSION b/VERSION
index 736134e..45181cc 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-17.11.0-ce-rc1
+17.11.0-ce-rc2