adrienverge / yamllint / 6962676365

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quoted-strings: Fix only-when-needed in flow maps and sequences

Flow maps and sequences need quotes if the values contain any of the
flow tokens ({}, [], ','). However, yamllint generates false positives
in these cases:

$ yamllint -d 'rules: {quoted-strings: {required: only-when-needed}}' - <<<'field: ["string[bracket]"]'
  1:9       error    string value is redundantly quoted with any quotes  (quoted-strings)

To fix this, track when inside a flow map/sequence and skip the quoting
checks except for the quoting type.

Closes #516

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