Use correct image name in Makefile
Use correct image name in Makefile

I expect this to cause the tests to start failing


Former-commit-id: 73e60291025d8649d1015f574a4c19fa759d9ff0
L-MA/libcalico,caseydavenport/libcalico,djosborne/libcalico,tomdee/libnetwork-plugin,TrimBiggs/libnetwork-plugin,alexhersh/libcalico,insequent/libcalico,robbrockbank/libcalico,projectcalico/libcalico,TrimBiggs/libnetwork-plugin,tomdee/libcalico,TrimBiggs/libcalico,projectcalico/libnetwork-plugin,plwhite/libcalico,Symmetric/libcalico