Add mutex lock to updateServer #2436

Job	Run time
cleanup	3s
changed-policy	16s
tag	3s
changed-multicluster	15s
changed-viz	12s
build-cli	5m 21s
build-core (cni-plugin)	4m 39s
build-core (controller)	4m 47s
build-core (policy-controller)	13m 19s
build-core (proxy)	3m 16s
build-ext (jaeger-webhook)	4m 59s
build-ext (metrics-api)	4m 28s
build-ext (tap)	3m 55s
build-ext (web)	6m 10s
test-core (cni-calico-deep)	6m 33s
test-core (deep)	5m 6s
test-ext (cluster-domain)	5m 56s
test-ext (default-policy-deny)	5m 56s
test-ext (external)	7m 3s
test-ext (rsa-ca)	4m 32s
test-ext (helm-upgrade)	6m 34s
test-ext (uninstall)	5m 15s
test-ext (upgrade-edge)	6m 29s
test-ext (upgrade-stable)	6m 7s
test-policy	0s
test-multicluster	0s
test-viz	0s
	1h 51m 14s

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