helm chart linting problem

Reproduction: bulk copyright edits in the

% git clone https://github.com/joey-onf/copyright
% git clone ssh://gerrit.opencord.org/voltha-helm-charts


% cd voltha-helm-charts
% ../copyright/gather-and-update.sh
% make lint

  [ERROR] Chart modified but version unchanged: voltha-stack/Chart.yaml (?????????????????)
  [ERROR] Chart modified but version unchanged: voltha-infra/Chart.yaml (?????????????????)

• Several charts are modified
• Chart.yaml versions are updated for the 1st batch of lint errors reported.
• While working through the list fixing problems, chart version displayed reports an invalid version string:

• • [ERROR] Chart modified but version unchanged: voltha-stack/Chart.yaml (?????????????????)
• This is due to no chart delta being detected
  • Conditional fails if version_diff "$chart" "$COMPARISON_BRANCH" 'old' 'new'; then
• The else condition attempts to obtain version by simple grep extraction:
  • get_version_by_git old "$chart" "$COMPARISON_BRANCH"
• Charts voltha-stack, voltha-infra and voltha contain multiple version strings
• Function get_version_by_git() becomes confused by the list so reports '????????????????'

declare -a buffer=([0]="version    : \"2.12.8\"" [1]="    version    : \"2.12.16\"" [2]="    version    : \"2.12.3\"" [3]="    version    : \"2.12.6\"" [4]="    version    : \"0.1.4\"")

To remedy the problem linting tool should be made aware of Chart.yaml syntax so it can extract the correct version string for comparison.