More features (#9)

* added config file implementation, refactoring
* add gitignore
* improved test
* preperations for more metrics
* added resource metrics
* added first bgp metrics
* added asn as label for bgp metrics
* added prefix and message counts to bgp metrics
* simplified
* Update README.md
* added yaml dependency
* fixed go routine call
* added timeout
* clean up
* added TLS support
* set default api port for TLS
* added routes metric
* added missing log information
* added type collectorContext to reduce the count of parameters for better readability
* added DHCP and DHCPv6 metrics
* filter for active dhcp leases only
* added pool metrics
* enable/disable feature in config file
* refactoring

* clean up

* comment fix

config/test/config.test.yml

@@ -8,4 +8,11 @@ devices:
   - name: test2
     address: 192.168.2.1
     user: test
-    password: 123
+    password: 123
+
+features:
+  bgp: true
+  dhcp: true
+  dhcpv6: true
+  routes: true
+  pools: true