Add possibility to set SecurityContext on container level

[FleischerT]

Allows the user to set SecuritContext configurations on container level such as allowPrivilegeEscalation: false

[cla-bot[bot]]

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[FleischerT]

@cla-bot check

[cla-bot[bot]]

The cla-bot has been summoned, and re-checked this pull request!

[nineinchnick]

Duplicated by #117