Reduce terminal garbling from multi-threaded pings. (#1514)
Reduce terminal garbling from multi-threaded pings. (#1514)

Restore the terminal options after each command.
projectcalico/calico-docker,projectcalico/calico-containers,projectcalico/calico-containers,insequent/calico-docker,caseydavenport/calico-docker,projectcalico/calico-docker,Metaswitch/calico-docker,caseydavenport/calico-containers,caseydavenport/calico-containers,Metaswitch/calico-docker,caseydavenport/calico-containers,projectcalico/calico-containers,insequent/calico-docker,caseydavenport/calico-docker