Restore missing asserts
Restore missing asserts


Former-commit-id: 83e5829104bc4ec229d17cf03ff3834cc88f3177
Symmetric/libcalico,projectcalico/libcalico,tomdee/libnetwork-plugin,TrimBiggs/libcalico,insequent/libcalico,TrimBiggs/libnetwork-plugin,L-MA/libcalico,caseydavenport/libcalico,TrimBiggs/libnetwork-plugin,djosborne/libcalico,alexhersh/libcalico,robbrockbank/libcalico,plwhite/libcalico,tomdee/libcalico,projectcalico/libnetwork-plugin