printFlexPersistentVolumeSource: fix format

[php-coder]

What this PR does / why we need it:
This PR fixes invalid format.

Special notes for your reviewer:
Addresses #56460 (comment)
Fixes #57694

Release note:

NONE

PTAL @liggitt
CC @simo5

[php-coder]

Connection error during awscli installation:

W1219 12:20:06.341] + pip install awscli
I1219 12:20:06.662] Downloading/unpacking awscli
I1219 12:20:07.137] Cleaning up...
I1219 12:20:07.292] Exception:
I1219 12:20:07.292] Traceback (most recent call last):
I1219 12:20:07.293]   File "/usr/lib/python2.7/dist-packages/pip/basecommand.py", line 122, in main
I1219 12:20:07.293]     status = self.run(options, args)
I1219 12:20:07.293]   File "/usr/lib/python2.7/dist-packages/pip/commands/install.py", line 290, in run
I1219 12:20:07.294]     requirement_set.prepare_files(finder, force_root_egg_info=self.bundle, bundle=self.bundle)
I1219 12:20:07.294]   File "/usr/lib/python2.7/dist-packages/pip/req.py", line 1198, in prepare_files
I1219 12:20:07.294]     do_download,
I1219 12:20:07.294]   File "/usr/lib/python2.7/dist-packages/pip/req.py", line 1376, in unpack_url
I1219 12:20:07.294]     self.session,
I1219 12:20:07.295]   File "/usr/lib/python2.7/dist-packages/pip/download.py", line 546, in unpack_http_url
I1219 12:20:07.295]     resp = session.get(target_url, stream=True)
I1219 12:20:07.295]   File "/usr/lib/python2.7/dist-packages/requests/sessions.py", line 469, in get
I1219 12:20:07.295]     return self.request('GET', url, **kwargs)
I1219 12:20:07.296]   File "/usr/lib/python2.7/dist-packages/pip/download.py", line 237, in request
I1219 12:20:07.296]     return super(PipSession, self).request(method, url, *args, **kwargs)
I1219 12:20:07.296]   File "/usr/lib/python2.7/dist-packages/requests/sessions.py", line 457, in request
I1219 12:20:07.296]     resp = self.send(prep, **send_kwargs)
I1219 12:20:07.297]   File "/usr/lib/python2.7/dist-packages/requests/sessions.py", line 569, in send
I1219 12:20:07.297]     r = adapter.send(request, **kwargs)
I1219 12:20:07.297]   File "/usr/lib/python2.7/dist-packages/requests/adapters.py", line 407, in send
I1219 12:20:07.297]     raise ConnectionError(err, request=request)
I1219 12:20:07.298] ConnectionError: ('Connection aborted.', error(104, 'Connection reset by peer'))

[php-coder]

/test pull-kubernetes-e2e-kops-aws

[php-coder]

/assign @janetkuo

[php-coder]

/retest

[liggitt]

/lgtm
/retest

[nikhita]

@liggitt Would require /approve no-issue.

[zjj2wry]

Fixes #57694

[php-coder]

/retest

[liggitt]

/approve no-issue

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: liggitt, php-coder

Associated issue requirement bypassed by: liggitt

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these OWNERS Files:

• pkg/printers/OWNERS [liggitt]

You can indicate your approval by writing /approve in a comment
You can cancel your approval by writing /approve cancel in a comment

[k8s-github-robot]

/test all [submit-queue is verifying that this PR is safe to merge]

[k8s-ci-robot]

@php-coder: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
pull-kubernetes-verify	1c41db6	link	/test pull-kubernetes-verify

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.

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/test-infra repository. I understand the commands that are listed here.

[k8s-github-robot]

Automatic merge from submit-queue (batch tested with PRs 57399, 57751, 57475). If you want to cherry-pick this change to another branch, please follow the instructions here.