update api version & glog -> klog

[wlan0]

updates to latest api version and uses structured logging using klog

@krishchow @brahmaroutu @jeffvance

[krishchow]

LGTM! Not sure why the tests are failing though

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: krishchow, wlan0

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[jeffvance]

From build log:

# github.com/kubernetes-sigs/container-object-storage-interface-controller/pkg/bucketrequest [github.com/kubernetes-sigs/container-object-storage-interface-controller/pkg/bucketrequest.test]
pkg/bucketrequest/bucketrequest_test.go:89:14: undefined: NewListener
pkg/bucketrequest/bucketrequest_test.go:132:14: undefined: NewListener
pkg/bucketrequest/bucketrequest_test.go:186:14: undefined: NewListener
note: module requires Go 1.15
ok  	github.com/kubernetes-sigs/container-object-storage-interface-controller/pkg/bucketaccessrequest	0.258s
FAIL	github.com/kubernetes-sigs/container-object-storage-interface-controller/pkg/bucketrequest [build failed]
?   	github.com/kubernetes-sigs/container-object-storage-interface-controller/pkg/util	[no test files]
?   	github.com/kubernetes-sigs/container-object-storage-interface-controller/release-tools	[no test files]
FAIL
make: *** [release-tools/build.make:110: test-go] Error 2

[brahmaroutu]

/lgtm