CI: spec test "Latest Puppet 6.x - Classes - 00" often exceeds maximum time limit for jobs

Description

The spec test "Latest Puppet 6.x - Classes - 00" often exceeds is maximum time limit in Travis CI and fails, even though the tests would pass if given more time:

Example pipeline at https://travis-ci.com/github/simp/pupmod-simp-simp/builds/178976044:

The job usually fails, but on occasion it manages to run fast enough to succeed. It is therefore (usually) possible to work around the issue by repeatedly restarting the failed job until it runs fast enough to succeed. This workaround is often necessary in order to get the pipeline to deploy new releases:

Example failure message at https://travis-ci.com/github/simp/pupmod-simp-simp/jobs/369925017#L4503:

Acceptance Criteria

None

Epic Link

None

Story Points

None

Components

Affects versions

Priority

Medium
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