fix: add default krb5 cc path

[edward2a]

Upon running master branch the following error was showing:

    May 11 10:19:42 worker-02 cifs.upcall: get_existing_cc: default ccache is FILE:/tmp/krb5cc_0

Checked on the host and the configuration was appropriate, mounting a cifs share did work approrpiately.

This error was showing specifically inside the smb container, so adding the configuration for the default krb5 cc path as expected by this sci.

What type of PR is this?
/kind bug

What this PR does / why we need it:
Added default krb5.conf to the Dockerfile in cmd/smbplugin/Dockerfile with content:

[libdefaults]
	default_ccache_name = FILE:/var/lib/kubelet/kerberos/krb5cc_%{uid}

Which issue(s) this PR fixes: #612

Fixes #

Requirements:

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

Special notes for your reviewer:

Release note:

Added default krb5.conf to look up krb5cc in /var/lib/kubelet/kerberos

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: edward2a / name: Eduardo (fc14f86)

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Hi @edward2a. Thanks for your PR.

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[andyzhangx]

/ok-to-test

[andyzhangx]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: andyzhangx, edward2a

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