Use common.utils function to check if docker/helm is installed (code … #161
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At some point the check_tool_installed method was moved to common.utils as a function, but it looks like the existing code wasn't deleted from artifact.py.
This PR fixes that. The code diff should be fairly self-explanatory.
The exception type raised changes from CLIError to MissingDependency, but as none of the code as try/except for this function, I think that's fine.