Updates to Wiremock - only rename file that exists, and update Wiremo…

[IWHarvey]

• What kind of change does this PR introduce (Bug fix, feature, docs update, ...)?
  Commodity update and bug fix

• What is the current behavior?
  Wiremock is very out of date.
  A wiremock commodity with a folder of WM configuration fails to provision with "mv: cannot stat '/wiremock/mappings/wiremock-fragment.json': No such file or directory"

• What is the new behavior (if this is a feature change)?
  Wiremock is up to date
  Doesn't fall over when provisioning with a folder of WM config and no wiremock-fragment.json

• Does this PR introduce a breaking change? If so, what actions will users need to take in order to regain compatibility?
  Possible with the WM upgrade but was unable to test as none of my wiremock configuration worked at all with 2.x

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