[Telemetry] Add hash shift for Android 21 devices configuration
[Telemetry] Add hash shift for Android 21 devices configuration

The hash shift changes where the tests are run while maintaining affinity. This shift should save ~30 minutes cycle time from slaves 1 and 3 and ~15 minutes from slave 2.

Note to Perf Sheriffs: This CL moves the tests on the Android slaves to acheive better load balancing. It is unexpected to see any regressions, but if you do see regressions and it is completly unexplained otherwise please add it to the associated bug with this CL, but do not revert it.

BUG=571103

Review URL: https://codereview.chromium.org/1541963002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#366474}

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