fix race in unit test and add some simple tests for utils

[avoltz]

What type of PR is this?

/kind test

What this PR does / why we need it:

Add some coverage to pkg/util tests.

Fix a race in csi-common test, described in commit text:

    Without this fix, running `go test -race -count 10` causes this failure:

    /var/folders/py/rwp4m4k977l9stj_f2kqrmxw000_5c/T/go-build3764188957/b001/csi-common.test flag redefined: log_dir
    --- FAIL: TestLogGRPC (0.00s)
    panic: /var/folders/py/rwp4m4k977l9stj_f2kqrmxw000_5c/T/go-build3764188957/b001/csi-common.test flag redefined: log_dir [recovered]
            panic: /var/folders/py/rwp4m4k977l9stj_f2kqrmxw000_5c/T/go-build3764188957/b001/csi-common.test flag redefined: log_dir

    goroutine 70 [running]:
    testing.tRunner.func1.2({0x17a37e0, 0xc0000b4180})
            /usr/local/Cellar/go/1.18.5/libexec/src/testing/testing.go:1389 +0x366
    testing.tRunner.func1()
            /usr/local/Cellar/go/1.18.5/libexec/src/testing/testing.go:1392 +0x5d2
    panic({0x17a37e0, 0xc0000b4180})
            /usr/local/Cellar/go/1.18.5/libexec/src/runtime/panic.go:844 +0x258
    flag.(*FlagSet).Var(0xc00020c120, {0x19668c0, 0x1d00f90}, {0x186cfd4, 0x7}, {0x188d879, 0x52})
            /usr/local/Cellar/go/1.18.5/libexec/src/flag/flag.go:879 +0x3a5
    flag.(*FlagSet).StringVar(...)
            /usr/local/Cellar/go/1.18.5/libexec/src/flag/flag.go:762
    k8s.io/klog/v2.InitFlags(0x0)
            /Users/avoltz/src/blob-csi-driver/vendor/k8s.io/klog/v2/klog.go:424 +0xee
    sigs.k8s.io/blob-csi-driver/pkg/csi-common.TestLogGRPC(0xc0000829c0)
            /Users/avoltz/src/blob-csi-driver/pkg/csi-common/utils_test.go:87 +0x45
    testing.tRunner(0xc0000829c0, 0x18ae070)
            /usr/local/Cellar/go/1.18.5/libexec/src/testing/testing.go:1439 +0x214
    created by testing.(*T).Run
            /usr/local/Cellar/go/1.18.5/libexec/src/testing/testing.go:1486 +0x725
    FAIL    sigs.k8s.io/blob-csi-driver/pkg/csi-common      4.298s
    FAIL

Which issue(s) this PR fixes:

Fixes #

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests
• tested upgrade from previous version

Special notes for your reviewer:

Release note:

none

[k8s-ci-robot]

Hi @avoltz. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[andyzhangx]

/ok-to-test

[andyzhangx]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: andyzhangx, avoltz

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