add global telemetry

[dmachard]

PR to add global telemetry

• [x] add global telemetry
• [x] metric to count number of stanza configured
• [x] metric to count in/out packets per stanza
• [x] metric to Monitor Dropped Packets per stanza configured #641
• [x] update all workers to support telemetry
• [x] add dashboard
• [x] add docs for config global/telemetry
• [x] server with https
• [x] add test for telemetry
• [x] perf sudo docker run ns1labs/flame -p 5355 -Q 150 192.168.1.2 -g randomlabel lblsize=20 lblcount=10 count=100000
• [x] fix #512

new config

globa:
  telemetry:
    enabled: true
    web-path: "/metrics"
    web-listen: ":9165"
    prometheus-prefix: "dnscollector_exporter"
    tls-support: false
    tls-cert-file: ""
    tls-key-file: ""
    client-ca-file: ""
    basic-auth-enable: false
    basic-auth-login: admin
    basic-auth-pwd: changeme

dashboard overview