(maint) Pre suite paths must be relative

[melissa]

When run with the absolute path, tests on Japanese windows end up with
an unescaped % in the path. This results in an error #<ArgumentError: malformed format string - %D>. If we ensure these paths are relative,
we should be able to avoid this failure.

[branan]

👍 from me

[joshcooper]

👍

Before

14:26:41     "pre_suite": [
14:26:41         "/tmp/jenkins/workspace/platform_puppet-agent_puppet-agent-integration-suite_daily-1.10.x/COMPONENT/puppet/SLAVE_LABEL/beaker/TEST_TARGET/windows2012r2_ja-64a%7Blocale=ja%7D/acceptance/.bundle/gems/ruby/2.3.0/gems/beaker-puppet-0.11.0/setup/common/000-delete-puppet-when-none.rb",
...
14:26:41 #<ArgumentError: malformed format string - %D>
14:26:41 /tmp/jenkins/workspace/platform_puppet-agent_puppet-agent-integration-suite_daily-1.10.x/COMPONENT/puppet/SLAVE_LABEL/beaker/TEST_TARGET/windows2012r2_ja-64a%7Blocale=ja%7D/acceptance/.bundle/gems/ruby/2.3.0/bundler/gems/beaker-b629407b01c2/lib/beaker/test_suite.rb:72

After:

    "pre_suite": [
        "../../beaker-puppet/setup/common/000-delete-puppet-when-none.rb",
        "../../beaker-puppet/setup/aio/010_Install.rb",
        "../../beaker-puppet/setup/aio/020_InstallCumulusModules.rb",
        "../../beaker-puppet/setup/aio/021_InstallAristaModule.rb",
        "../../beaker-puppet/setup/common/025_StopFirewall.rb",
        "../../beaker-puppet/setup/common/030_StopSssd.rb",
        "../../beaker-puppet/setup/common/040_ValidateSignCert.rb",
        "../../beaker-puppet/setup/aio/045_EnsureMasterStarted.rb"
    ],