Debug dedicated perf test runner on core_performance_testbed

merged in changes from 3415296-use-a-dedicated

requested review from @catch

added 6 commits

• e10ccd7c - Use the runner hostname for SIMPLETEST_BASE_URL
• 25c6dbf2 - Try to remove some changes that didn't fix things.
• f0da6c85 - Add back --allowed-origins.
• 27549cd5 - Remove unnecessary changes.
• 10206fda - Don't duplicate FF_NETWORK_PER_BUILD
• e5e20d39 - Merge remote-tracking branch 'source-repo/3415296-use-a-dedicated' into...

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• 5b5aaebb - testing ramdisk use

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• 3a39d1f4 - ignore rambuild

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• 53ff2efb - Fix rsync command

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• 3e4d54f5 - fix rsync path

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• 4e39b723 - fix rsync path

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• 62a8159a - fix rsync path

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• 3173148d - remove sleep

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• da4b0906 - fix rsync path

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• ecde98ee - fix tmpfs paths

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• 3c0c3d7d - fix chromedrive log path

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• b81a1ac6 - try again

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• 3a8429b9 - revert to fix chrome log

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• 5f1850b2 - Remove sleep command in pipeline.yml

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