changed 'node stop' command to use get_endpoints
changed 'node stop' command to use get_endpoints


Former-commit-id: dbdae8754898cef79564f40bac1fce1c223fee15
projectcalico/libcalico,alexhersh/libcalico,robbrockbank/libcalico,caseydavenport/libcalico,TrimBiggs/libnetwork-plugin,L-MA/libcalico,Symmetric/libcalico,TrimBiggs/libnetwork-plugin,tomdee/libcalico,djosborne/libcalico,tomdee/libnetwork-plugin,projectcalico/libnetwork-plugin,TrimBiggs/libcalico,plwhite/libcalico,insequent/libcalico