Very simple handling of Etcd errors
Very simple handling of Etcd errors


Former-commit-id: ed3bcd80f03069115ec12dc6ff917e913d48a359
Symmetric/libcalico,TrimBiggs/libnetwork-plugin,TrimBiggs/libcalico,caseydavenport/libcalico,insequent/libcalico,TrimBiggs/libnetwork-plugin,projectcalico/libcalico,tomdee/libnetwork-plugin,djosborne/libcalico,plwhite/libcalico,robbrockbank/libcalico,L-MA/libcalico,tomdee/libcalico,projectcalico/libnetwork-plugin,alexhersh/libcalico