Workaround: retry initial etcd query in STs.
Workaround: retry initial etcd query in STs.

Former-commit-id: 3a48b551d4a51934c9ca71f7fa3503d9887a47ae
insequent/libcalico,TrimBiggs/libcalico,djosborne/libcalico,robbrockbank/libcalico,tomdee/libcalico,TrimBiggs/libnetwork-plugin,projectcalico/libcalico,Symmetric/libcalico,caseydavenport/libcalico,alexhersh/libcalico,projectcalico/libnetwork-plugin,L-MA/libcalico,plwhite/libcalico,tomdee/libnetwork-plugin,TrimBiggs/libnetwork-plugin