allow csi-attacher component to be configured

[nschad]

How to categorize this PR?

/kind enhancement
/kind api-change
/area storage
/platform openstack

What this PR does / why we need it:

Enables the configuration of the csi-attacher component by providing 5 additional flags for providing timeout and retries in case the storage is not so fast.

Example config of the gardener-extension-provider-openstack.

csi:
  csiAttacher:
    timeout: 3m
    verbosity: 5
    retryIntervalStart: 1m
    reconcileSync: 15m
    retryIntervalMax: 5m

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Release note:

Enables part-configuration of the csi-attacher (--retry-interval-max, --retry-interval-start, --reconcile-sync, --timeout, --v) component for all shoots.

[gardener-robot]

@nschad Thank you for your contribution.

[gardener-robot-ci-2]

Thank you @nschad for your contribution. Before I can start building your PR, a member of the organization must set the required label(s) {'reviewed/ok-to-test'}. Once started, you can check the build status in the PR checks section below.

[nschad]

Ah yeah my make generate generate a different output (no idea why really, it does work though). I will see if if I can fix that somehow

Should be resolved hopefully

[timebertt]

Some nits from reviewing the first two commits.
Can you check the CI failures and run make verify locally?

[gardener-robot]

@nschad You need rebase this pull request with latest master branch. Please check.

[kon-angelo]

The PR itself looks okay, however given #572 maybe we would need a more "generic" way to map an attacher configuration to a CSI driver and not have this as a "global" setting for all drivers. WDYT?

[nschad]

The PR itself looks okay, however given #572 maybe we would need a more "generic" way to map an attacher configuration to a CSI driver and not have this as a "global" setting for all drivers. WDYT?

I agree. I made some suggestions in my last PR. However they were all refused. I don't see how to create a generic config while checking for valid flags.

Personally I don't like how this PR is implemented.