Chart annotations cont, manager container security context

[mwm5945]

What this PR does / why we need it:
Fixes @agrski 's comment for the correct indentation on the manager deployment annotations, adds a container security context to the same deployment.

Which issue(s) this PR fixes:

Fixes #3698

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

add container security context to controller manager

[seldondev]

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[seldondev]

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[mwm5945]

@agrski This fixes your comment in the last annotations PR. Also @cliveseldon @axsaucedo, this adds a container security context (different from a pod security context) to allow the container to utilize those fields (such as readOnlyRootFileSystem)