Authentication with Kerberos credentials

[GamerGirlandCo]

What type of PR is this?

/kind feature

What this PR does / why we need it: This PR implements authentication with a kerberos principal and password when mounting NFS shares.

Which issue(s) this PR fixes:

Fixes #525

Special notes for your reviewer:

• I changed the Dockerfile's base image to debian:stable-slim Justification: services cannot be started due to a missing file /lib/lsb/init-functions
• I changed the Dockerfile's entrypoint to a script (entry.sh) The script is created in the Dockerfile inline, and you can review it here Justification: this is so we can start necessary services (rpcbind and nfs-common) if and only if we're in the controller pod. Otherwise, the nfsplugin binary is invoked with the exact same arguments the pod's nfs container was started with.

Does this PR introduce a user-facing change?:

Added the ability to authenticate with kerberos-protected NFS shares
The following new parameters may be specified when creating or updating a storage class:
- **`authPrincipal`**
  The principal that will be used to authenticate to the share
- **`authPasswordSecret`**
  The secret containing the authentication password
- **`authKrbConf`**
  The secret containing contents of a krb5.conf with information about how to connect to a realm.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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• :white_check_mark: login: GamerGirlandCo / name: ☙◦ The Tablet ❀ GamerGirlandCo ◦❧ (13221c1916c2d348856d0f8947dfb07d78217e02, 16b2aa7bf9209463b188effdf1ec724535d79ff7, 250ff6d4372cd2865cffe745402dae385e60c1cc, 2a4e0cdefbafa9aa7c1d192f4efdef8ec4fcead9, 41ead104bdbf2344ce0c775cbb7c48c4380fe0f4, 530c840591dc38ae5dc01cb012ccced240aa5e2c, 714dfa5bfeda4fc2571f26a926eb8e33eaabca8e, 8a474caac116e9b09a3aee1a0b01a92f62f639d9, 8c629801cdbd0a05feaa2e80b23cd9ae36e529a4, 903cfea45b84fd6545aafba3262c23cf2ececac2, a3003d7dc1f8fd11b7f10a99344f51871c846e6b, a6e1f3372958c1385391d53e471e1ca9a6701a6a, ab4a8636f653d0b44c0ffdbfaad89dbe8b232145, ae1b082acbc84ce62f052f1ae7a5e7192c44409f, afbbd54d3112becba85ad1c3be3acc81bba68e56, c377d73bcba09df8cf69b5b2b4b8ce419c646fd8, c466707f8addcc05b183d9af6780bfe2cd5124e5, c72a7fe9a2f4de0d3bd70f8881c9d9ade371025b, d615d7f0911f33cfec6bc72fc8e51b1d9ca7af1f, dd802252f9ea64a4d04d21903f55ded9aff33969, ed9596aee232536ac0084ca4658a185e597d5b12, f29f24c908fdc0d8d72514aa38e456a50c7f3102, f63481829d10f266f2324087015c4b02e07aba23, f9351ae439543023c54d0bdc3ae626fd11fd5ced)

[k8s-ci-robot]

Hi @GamerGirlandCo. Thanks for your PR.

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[GamerGirlandCo]

/retest

[GamerGirlandCo]

/retest

[GamerGirlandCo]

/retest

[GamerGirlandCo]

/test pull-csi-driver-nfs-e2e-capz

[GamerGirlandCo]

/retest-required

[k8s-ci-robot]

@GamerGirlandCo: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-csi-driver-nfs-e2e-capz	a3003d7dc1f8fd11b7f10a99344f51871c846e6b	link	unknown	/test pull-csi-driver-nfs-e2e-capz

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[k8s-ci-robot]

PR needs rebase.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.