bpf/proxy: add info logging when Syncer iteration start/ends
bpf/proxy: add info logging when Syncer iteration start/ends

felix-0-20143-5-felixfv[stdout] 2020-09-11 18:30:48.868 [INFO][7] felix/syncer.go 710: Syncing k8s state and bpf maps after start
felix-0-20143-5-felixfv[stdout] 2020-09-11 18:30:48.869 [INFO][7] felix/syncer.go 717: Startup sync complete
felix-0-20143-5-felixfv[stdout] 2020-09-11 18:30:48.869 [INFO][7] felix/syncer.go 604: applying new state, 1 service
felix-0-20143-5-felixfv[stdout] 2020-09-11 18:30:48.873 [INFO][7] felix/syncer.go 700: new state written

neiljerram/felix,neiljerram/felix,neiljerram/felix,Metaswitch/calico,neiljerram/felix,Metaswitch/calico