[bug] bond re-added to the same bridge, even if it already member of one

[xenolog]

Debug: L2_bond[bond1](provider=lnx): Actual-bridge-list: {"br9"=>{:stp=>false, :external_ids=>:absent, :vendor_specific=>{}, :br_type=>:lnx}}
Debug: Puppet::Type::L2_bond::ProviderLnx: No OVS bridges found, because error while 'ovs-vsctl list-br' execution
Debug: Executing '/sbin/brctl show'
Debug: Puppet::Type::L2_bond::ProviderLnx: LNX ports to bridges mapping: ---
  bond1:
    :bridge: br9
    :br_type: :lnx
Debug: L2_bond[bond1](provider=lnx): Actual-port-bridge-mapping: '{"bond1"=>{:bridge=>"br9", :br_type=>:lnx}}'
Debug: Executing '/sbin/ip --force link set dev bond1 down'
Debug: Executing '/sbin/brctl delif br9 bond1'
Debug: Executing '/sbin/brctl addif br9 bond1'
Debug: Executing '/sbin/ip link set dev bond1 up'
Debug: L2_bond[bond1](provider=lnx): Change bridge