CA-99828 Add a new bond option: lacp-fallback-ab to xcp-networkd

lacp-fallback-ab allows lacp bond to fallback to active-backup
when there is no lacp partner.

Signed-off-by: Ravi Kondamuru <Ravi.Kondamuru@citrix.com>
Acked-by: Rob Hoes <rob.hoes@citrix.com>
CA-99828 Add a new bond option: lacp-fallback-ab to xapi

lacp-fallback-ab allows lacp bond to fallback to active-backup
when there is no lacp partner.

Signed-off-by: Ravi Kondamuru <Ravi.Kondamuru@citrix.com>
Acked-by: Rob Hoes <rob.hoes@citrix.com>
Merge pull request #1698 from robhoes/lacpfb64

Add LACP fallback option