update gitvalidation epoch

updating the gitvalidation epoch to speed up
git validations.

Signed-off-by: baude <bbaude@redhat.com>

Makefile

@@ -1,5 +1,5 @@
 GO ?= go
-EPOCH_TEST_COMMIT ?= 5d52f74
+EPOCH_TEST_COMMIT ?= dd0d35d
 HEAD ?= HEAD
 PROJECT := github.com/projectatomic/libpod
 GIT_BRANCH := $(shell git rev-parse --abbrev-ref HEAD 2>/dev/null)