Collect IP and MAC address properly

With this commit we fix a bug that prevented IP address and MAC
from being collected properly. NetworkManager's refresh parser has
been updated to be more robust and effective and some complex VCR unit
tests were added where we ensure that things will work on a more
advanced networking setup as well. Performance optimization was achieved
like this:

BEFORE: first all vdcs were fetched, then all vapps per vdc, then
all vms per vapp. Then finally the network data was fetched from the
VM, where only the most basic data was present (e.g. MAC was missing).

NOW: we load VMs from VMDB (inventoried by cloud provider) and then
invoke a single API call per VM to fetch networking data for it.

Signed-off-by: Miha Pleško <miha.plesko@xlab.si>

app/models/manageiq/providers/vmware/network_manager/floating_ip.rb

@@ -0,0 +1,2 @@
+class ManageIQ::Providers::Vmware::NetworkManager::FloatingIp < ::FloatingIp
+end

app/models/manageiq/providers/vmware/network_manager/network_router.rb

@@ -0,0 +1,2 @@
+class ManageIQ::Providers::Vmware::NetworkManager::NetworkRouter < ::NetworkRouter
+end