domainGetAll() invokes `pollUsageNow` twice for virtual machines with multiple libvirtd connections

[jelly]

Calling domainGetAll multiple times invokes pollUsageNow every time which calls pollVmUsage for every vm in the redux state. So when first calling domainGetAll with the "system" connection, and then the "user" connection with pollVmUsage will be invoked twice for all system virtual machines.

export async function domainGetAll({ connectionName } : { connectionName: ConnectionName }): Promise<void> {
    try {
        const [objPaths] = await call<[string[]]>(connectionName, '/org/libvirt/QEMU', 'org.libvirt.Connect', 'ListDomains', [0],
                                                  { timeout, type: 'u' });
        store.dispatch(deleteUnlistedVMs(connectionName, [], objPaths));
        await Promise.all(objPaths.map(path => domainGet({ connectionName, id: path })));
        pollUsageNow();
    } catch (ex) {
        console.warn('GET_ALL_VMS action failed:', String(ex));
        throw ex;
    }
}