tests: Fix loadbalancer tests
tests: Fix loadbalancer tests

 * Delay start of wrk and ab tests for two seconds after the containers
   have been started. Fixes sporadic test failures. Issue still unclear
   as DAD is disabled. on the global addresses.
 * Do not run monitor in the background. Only slows down the test and is
   often unreliable inside guest VMs due to speed.
 * Disable recompilation with debugging enabled/disabled. Let the user
   decide and enable it upon test failure.

Signed-off-by: Thomas Graf <5f50a84c1fa3bcff146405017f36aec1a10a9e38@cilium.io>

scanf/cilium,eloycoto/cilium,mskarbek/cilium,eloycoto/cilium,mskarbek/cilium,scanf/cilium,scanf/cilium,eloycoto/cilium,tgraf/cilium,cilium/cilium,eloycoto/cilium,cilium/cilium,gumpt/cilium,mskarbek/cilium,cilium/cilium,eloycoto/cilium,tgraf/cilium,michi-covalent/cilium,gumpt/cilium,tklauser/cilium,tklauser/cilium,scanf/cilium,cilium/cilium,eloycoto/cilium,tgraf/cilium,michi-covalent/cilium,mskarbek/cilium,gumpt/cilium,cilium/cilium,gumpt/cilium,mskarbek/cilium,gumpt/cilium,michi-covalent/cilium,tklauser/cilium,scanf/cilium,cilium-team/cilium,michi-covalent/cilium,scanf/cilium,tgraf/cilium,mskarbek/cilium,eloycoto/cilium,tklauser/cilium,scanf/cilium,cilium-team/cilium,michi-covalent/cilium,tgraf/cilium,tgraf/cilium,gumpt/cilium,tklauser/cilium,gumpt/cilium