Prevent IPA from picking up the IPv6 link-local address
as a callback_url in cases where it gets tried before other
addressing methods havn't complete yet. In this scenario IPA
sleeps for 10 seconds and then retries giving the nic a chance to
configure its routable IP address.
Change-Id: Ic53334c630180f0d77bb0231e548d2c44bfe55ca
Closes-Bug: #1732692