Should initialize controller-runtime logging

[erikgb]

When approver-policy starts, this is logged on startup. Probably related to controller-runtime 0.15.0 upgrade.

I0620 06:50:37.637698       1 controller.go:219] controller-manager "msg"="Starting workers" "controller"="certificaterequest" "controllerGroup"="cert-manager.io" "controllerKind"="CertificateRequest" "worker count"=1
[controller-runtime] log.SetLogger(...) was never called, logs will not be displayed:
goroutine 291 [running]:
runtime/debug.Stack()
	/usr/local/go/src/runtime/debug/stack.go:24 +0x65
sigs.k8s.io/controller-runtime/pkg/log.eventuallyFulfillRoot()
	/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.15.0/pkg/log/log.go:59 +0xbd
sigs.k8s.io/controller-runtime/pkg/log.(*delegatingLogSink).WithName(0xc0003e3a40, {0x1e9c6f9, 0x9})
	/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.15.0/pkg/log/deleg.go:147 +0x4c
github.com/go-logr/logr.Logger.WithName(...)
	/go/pkg/mod/github.com/go-logr/logr@v1.2.4/logr.go:336
sigs.k8s.io/controller-runtime/pkg/webhook/admission.(*Webhook).getLogger.func1()
	/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.15.0/pkg/webhook/admission/webhook.go:182 +0x63
sync.(*Once).doSlow(0x0?, 0xc000101040?)
	/usr/local/go/src/sync/once.go:74 +0xc2
sync.(*Once).Do(...)
	/usr/local/go/src/sync/once.go:65
sigs.k8s.io/controller-runtime/pkg/webhook/admission.(*Webhook).getLogger(0xc00026d720?, 0xc0003b4400?)
	/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.15.0/pkg/webhook/admission/webhook.go:180 +0x53
sigs.k8s.io/controller-runtime/pkg/webhook/admission.(*Webhook).ServeHTTP(0xc00026d720, {0x7fea55a33ef8?, 0xc0004735e0}, 0xc000517200)
	/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.15.0/pkg/webhook/admission/http.go:96 +0xc34
github.com/prometheus/client_golang/prometheus/promhttp.InstrumentHandlerInFlight.func1({0x7fea55a33ef8, 0xc0004735e0}, 0x2173d00?)
	/go/pkg/mod/github.com/prometheus/client_golang@v1.15.1/prometheus/promhttp/instrument_server.go:60 +0xd4
net/http.HandlerFunc.ServeHTTP(0x2173da0?, {0x7fea55a33ef8?, 0xc0004735e0?}, 0xc0013fb828?)
	/usr/local/go/src/net/http/server.go:2122 +0x2f
github.com/prometheus/client_golang/prometheus/promhttp.InstrumentHandlerCounter.func1({0x2173da0?, 0xc000170a80?}, 0xc000517200)
	/go/pkg/mod/github.com/prometheus/client_golang@v1.15.1/prometheus/promhttp/instrument_server.go:147 +0xc5
net/http.HandlerFunc.ServeHTTP(0x7d9365?, {0x2173da0?, 0xc000170a80?}, 0x40dd0a?)
	/usr/local/go/src/net/http/server.go:2122 +0x2f
github.com/prometheus/client_golang/prometheus/promhttp.InstrumentHandlerDuration.func2({0x2173da0, 0xc000170a80}, 0xc000517200)
	/go/pkg/mod/github.com/prometheus/client_golang@v1.15.1/prometheus/promhttp/instrument_server.go:109 +0xc7
net/http.HandlerFunc.ServeHTTP(0xc000170a80?, {0x2173da0?, 0xc000170a80?}, 0x1ea32e6?)
	/usr/local/go/src/net/http/server.go:2122 +0x2f
net/http.(*ServeMux).ServeHTTP(0xc000538ee8?, {0x2173da0, 0xc000170a80}, 0xc000517200)
	/usr/local/go/src/net/http/server.go:2500 +0x149
net/http.serverHandler.ServeHTTP({0x2164928?}, {0x2173da0, 0xc000170a80}, 0xc000517200)
	/usr/local/go/src/net/http/server.go:2936 +0x316
net/http.(*conn).serve(0xc001129dd0, {0x2174b70, 0xc000568a50})
	/usr/local/go/src/net/http/server.go:1995 +0x612
created by net/http.(*Server).Serve
	/usr/local/go/src/net/http/server.go:3089 +0x5ed