Revert "Upgrade auto-value to 1.5.1"
Revert "Upgrade auto-value to 1.5.1"

Version 1.5.1 doesn't work with Eclipse Oxygen.1a (4.7.1a) [1].

Revert it until the issue is fixed and a new version is released.

This reverts commit 88ce029e9d9409557f941f157419fd89c39a7ec9.

[1] https://github.com/google/auto/issues/539

Change-Id: I3f864a9795ac296e5489fd7f86bf4db0d1c099c3

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