tests: fixed race_condition with max_prefix

The following tests:
- ipam
- ipam connectivity
- ipam to non-ipam
set the mac_prefix using nbctl.
However, it can happen that both northd and nbctl sets the mac_prefix
at the same time, which might result in the mac_prefix from nbctl to
be dropped.

Signed-off-by: Xavier Simonart <[email protected]>
Signed-off-by: Dumitru Ceara <[email protected]>
(cherry picked from commit 13ca6d5)

tests/ovn.at

@@ -8241,6 +8241,7 @@ check_dynamic_addresses() {
     check_row_count nb:Logical_Switch_Port 1 name="$1" dynamic_addresses="$arg"
 }
 
+check ovn-nbctl --wait=sb sync
 # Add a port to a switch that does not have a subnet set, then set the
 # subnet which should result in an address being allocated for the port.
 ovn-nbctl --wait=hv set NB_Global . options:mac_prefix="0a:00:00:00:00:00"
@@ -8556,7 +8557,7 @@ OVN_FOR_EACH_NORTHD([
 AT_SETUP([ipam connectivity])
 ovn_start
 
-ovn-nbctl lr-add R1
+ovn-nbctl --wait=sb lr-add R1
 
 # Test for a ping using dynamically allocated addresses.
 ovn-nbctl --wait=hv set NB_Global . options:mac_prefix="0a:00:00:00:00:00"
@@ -20758,6 +20759,7 @@ OVN_FOR_EACH_NORTHD([
 AT_SETUP([ipam to non-ipam])
 ovn_start
 
+check ovn-nbctl --wait=sb sync
 ovn-nbctl --wait=hv set NB_Global . options:mac_prefix="0a:00:00:00:00:00"
 ovn-nbctl ls-add sw0
 ovn-nbctl lsp-add sw0 p0 -- lsp-set-addresses p0 dynamic