Include ipsets information in Agent supportbundle

[antoninbas]

Antrea defines ipsets for some features. The supportbundle currently includes iptables rules, but does not include ipset rules.

Reference:

antrea/pkg/support/dump_others.go

Lines 50 to 60 in 4e74a6b

	func (d *agentDumper) dumpIPTables(basedir string) error {
	c, err := iptables.New(d.v4Enabled, d.v6Enabled)
	if err != nil {
	return err
	}
	data, err := c.Save()
	if err != nil {
	return err
	}
	return writeFile(d.fs, filepath.Join(basedir, "iptables"), "iptables", data)
	}

[ADITYATIWARI342005]

/assign

[hongliangl]

Maybe we should include nftables as well.

[antoninbas]

@hongliangl can you open a separate issue?

[hongliangl]

@hongliangl can you open a separate issue?

Done, see #7546