show, nm: Refresh nmclient for each show call

NM client represents the interface to NM.
In most cases, it is up to date. However, immediately after the mainloop
is completed, the verification step kicks in and calls `show`, at which
point the nmclient seems to be out-of-sync.

For consistency, on each call to `show`, the NM client is refreshed
(object recreated).

Note: `show` should not be called from within the mainloop as the NM
client must remain unchanged.

Signed-off-by: Edward Haas <edwardh@redhat.com>

libnmstate/netinfo.py

@@ -38,6 +38,8 @@ def show(include_status_data=False):
     When include_status_data is set, both are reported, otherwise only the
     configuration data is reported.
     """
+    client = nm.nmclient.client(refresh=True)
+
     report = {Constants.INTERFACES: interfaces()}
     if include_status_data:
         report['capabilities'] = capabilities()
@@ -51,7 +53,6 @@ def show(include_status_data=False):
         ),
     }
 
-    client = nm.nmclient.client()
     report[Constants.DNS] = {
         DNS.RUNNING: nm_dns.get_running(),
         DNS.CONFIG: nm_dns.get_config(