[network-manager-openconnect] Set can-persist property

[dwmw2 <dwmw2 src gnome org>]

commit f8e386e2c9522cb93a604eab9e534cb1f98ff18c
Author: David Woodhouse <dwmw2 infradead org>
Date:   Thu Mar 8 19:49:01 2018 +0000

    Set can-persist property
    
    OpenConnect can persist and reconnect when the underlying physical
    connection goes away or changes. It does rather depend on NetworkManager
    not screwing up the routes and leaving the VPN gateway routed *through*
    the VPN itself, and it would be kind of nice to accelerate the reconnect
    by sending SIGUSR2 to openconnect to make it do an immediate reconnect
    when a physical link comes back up, instead of waiting for Dead Peer
    Detection. But basically, it should work.

 src/nm-openconnect-service-openconnect-helper.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/src/nm-openconnect-service-openconnect-helper.c b/src/nm-openconnect-service-openconnect-helper.c
index 94eae77..279230c 100644
--- a/src/nm-openconnect-service-openconnect-helper.c
+++ b/src/nm-openconnect-service-openconnect-helper.c
@@ -519,6 +519,9 @@ main (int argc, char *argv[])
        else
                helper_failed (proxy, "VPN Gateway");
 
+       val = g_variant_new_boolean (TRUE);
+       g_variant_builder_add (&builder, "{sv}", NM_VPN_PLUGIN_CAN_PERSIST, val);
+
        /* Tunnel device */
        val = str_to_gvariant (getenv ("TUNDEV"), FALSE);
        if (val)