fix pb when use securityContext and add opportunity to add storageclass

[obeyler]

This PR is a

• Feature Implementation
• Bug Fix
• Documentation

What this PR does / why we need it:
-Feature: add the opportunity to use a specific storageClass, it's mandatory when no default storageclass is defined inside a K8S.
In our casen we have multiple StorageClass in our cluster, so as each one has its strengths, we don't put a particular one as a default to force the user to ask himself the question of which one to choose and why he chose it.

It also fix a pb on securitycontext

Which issue(s) this PR fixes
Fixes #2819
-Bug fix: If a securityContext is set the process is not able to create directory

I0609 12:50:10.145130       1 controller_manager.go:135] Using inClusterConfig to talk to service catalog API server -- make sure your API server is registered with the aggregator
Error: failed to establish SecureServingOptions mkdir /var/run/kubernetes-service-catalog: permission denied

To solve it I create an emptyDir volume
The securitycontext is also add for job and webhook

Please leave this checklist in the PR comment so that maintainers can ensure a good PR.

Merge Checklist:

• New feature
  • Tests
  • Documentation
• SVCat CLI flag
• Server Flag for config
  • Chart changes
  • removing a flag by marking deprecated and hiding to avoid
    breaking the chart release and existing clients who provide a
    flag that will get an error when they try to update

[k8s-ci-robot]

Hi @obeyler. 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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[mszostok]

/ok-to-test

[obeyler]

/retest

[obeyler]

@jberkhahn @MHBauer I don't see why this two last test failed. Do you think that it could be something that occured without my change ?

[jberkhahn]

given that you're just plumbing stuff through the Helm charts I find it very unlikely the image build is failing because of that. It looks like it's timing out. Same of the integration tests, which also look like they're timing out. Prow might just be overloaded right now.

[obeyler]

/retest

[obeyler]

hi @jberkhahn @MHBauer just waiting for your /lgtm label now :-)

[jberkhahn]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jberkhahn, obeyler

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