Rework loadbalancer server selection logic #8901

Job	Run time
build / Build	7m 4s
Integration Tests (certrotation)	1m 35s
Integration Tests (cacertrotation)	1m 56s
Integration Tests (etcdrestore)	2m 17s
Integration Tests (localstorage)	1m 24s
Integration Tests (startup)	7m 19s
Integration Tests (custometcdargs)	48s
Integration Tests (etcdsnapshot)	7m 49s
Integration Tests (kubeflags)	6m 58s
Integration Tests (longhorn)	2m 40s
Integration Tests (secretsencryption)	2m 48s
Integration Tests (flannelnone)	1m 24s
	44m 2s

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