Tests

Bump third_party/openthread/repo from `f0b6fce` to `d015004` #997

Job	Run time
REPL Tests - Darwin	0s
REPL Tests - Linux	1h 33m 30s
Test Suites - Darwin (no-ble-asan-clang)	1h 14m 8s
Test Suites - Linux (no-ble-tsan-clang)	1h 48m 44s
Test Suites - Darwin (no-ble-tsan-clang)	1h 53m 7s
	6h 29m 29s

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