Address/Investigate a WG fv flake (#2499)
Address/Investigate a WG fv flake (#2499)

Address/Investigate a WG fv flake, by:
* adding connectivity timeout
* adding onFailed callback to check connectivity using 'ping' test

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