[th/fix-modify_policy_based_routing_connection] avoid race in "@modify_policy_based_routing_connection"

Test "@modify_policy_based_routing_connection" activates a profile with IPv4 and IPv6 auto methods enabled (and ipv4.may-fail=yes). This means, the device might be already considered up without an IPv4 address.

Afterwards, the test calls

  * Create PBR files for profile " con_general " and " testG " device in table " 1 "

which then tries to get the IPv4 address. If it fails, because the address is not yet configured the test will fail.

Let the "Create PBR files for profile ..." step by default retry for up to 5 seconds to get a valid IPv4 address.

https://bugzilla.redhat.com/show_bug.cgi?id=2079409#c1

@RunFeatures:general @RunTests:pass,policy_based_routing,modify_policy_based_routing_connection