fix framework failure in regression test

By the way, this is the log from regression test
2014/11/26 14:51:10 etcdserver: start member 9bd5977152944999 in cluster da4efeaf7ed7c6b2
2014/11/26 14:51:10 etcdserver: set snapshot count to default 10000
2014/11/26 14:51:10 etcdserver: added local member 9bd5977152944999 [http://127.0.0.1:51375] to cluster da4efeaf7ed7c6b2
2014/11/26 14:51:10 raft: elected leader 9bd5977152944999 at term 1
2014/11/26 14:51:10 etcdserver: published {Name:framework_regression_test ClientURLs:[http://127.0.0.1:51376]} to cluster da4efeaf7ed7c6b2
dummyMaster:2014/11/26 14:51:10 framework_regression_test.go:58: Exiting from dummyMaster.Init
2014/11/26 14:51:10 framework.go:289: serving http on 127.0.0.1:51378
dummySlave:2014/11/26 14:51:10 framework_regression_test.go:148: Enter dummySlave.Init
2014/11/26 14:51:10 framework.go:289: serving http on 127.0.0.1:51380
dummyMaster:2014/11/26 14:51:10 framework_regression_test.go:82: Exiting from dummyMaster.SetEpoch
dummySlave:2014/11/26 14:51:10 framework_regression_test.go:148: Enter dummySlave.Init
2014/11/26 14:51:10 framework.go:289: serving http on 127.0.0.1:51379
2014/11/26 14:56:10 framework.go:356: Can't parse epoch from etcd
2014/11/26 14:56:10 framework.go:356: Can't parse epoch from etcd
2014/11/26 14:56:10 framework.go:356: Can't parse epoch from etcd