atf_python: allow test scripts to pass jail options

Test scripts based on atf_python can now pass jail command options via the
'opts' key in the 'vnetX' key of TOPOLOGY.

Reviewed by:	melifaro
MFC after:	1 week
Sponsored by:	Rubicon Communications, LLC ("Netgate")
Differential Revision:	https://reviews.freebsd.org/D52761

tests/atf_python/sys/net/vnet.py

@@ -283,14 +283,15 @@ def _wait_interfaces(vnet_name: str, ifaces: List[str]) -> List[str]:
             time.sleep(0.1)
         return not_matched
 
-    def create_vnet(self, vnet_alias: str, ifaces: List[VnetInterface]):
+    def create_vnet(self, vnet_alias: str, ifaces: List[VnetInterface], opts: List[str]):
         vnet_name = "pytest:{}".format(convert_test_name(self.topology_id))
         if self._vnets:
             # add number to distinguish jails
             vnet_name = "{}_{}".format(vnet_name, len(self._vnets) + 1)
         iface_cmds = " ".join(["vnet.interface={}".format(i.name) for i in ifaces])
-        cmd = "/usr/sbin/jail -i -c name={} persist vnet {}".format(
-            vnet_name, iface_cmds
+        opt_cmds = " ".join(["{}".format(i) for i in opts])
+        cmd = "/usr/sbin/jail -i -c name={} persist vnet {} {}".format(
+            vnet_name, iface_cmds, opt_cmds
         )
         jid = 0
         try:
@@ -421,7 +422,10 @@ def setup_topology(self, topo: Dict, topology_id: str):
                     idx = len(iface_map[iface_alias].vnet_aliases)
                     iface_map[iface_alias].vnet_aliases.append(obj_name)
                     vnet_ifaces.append(iface_map[iface_alias].ifaces[idx])
-                vnet = vnet_factory.create_vnet(obj_name, vnet_ifaces)
+                opts = []
+                if "opts" in obj_data:
+                    opts = obj_data["opts"]
+                vnet = vnet_factory.create_vnet(obj_name, vnet_ifaces, opts)
                 vnet_map[obj_name] = vnet
                 # Allow reference to VNETs as attributes
                 setattr(self, obj_name, vnet)