(IAC-1420) Enforce UTF-8 when running puppet on the test target

[david22swan]

Forcibly set the locale of the command to prevent any invalid byte sequences from being returned.

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[david22swan]

Fix works on Postgresql: puppetlabs/puppetlabs-postgresql#1257

[david22swan]

Change works correct on concat to: puppetlabs/puppetlabs-concat#694