Revert "Merge pull request #25131 from javierhonduco/javierhonduco/clone_depth_to_1"
Revert "Merge pull request #25131 from javierhonduco/javierhonduco/clone_depth_to_1"

This reverts commit acf0bb3f4945f6fda4ac7170b3a0f8fa3becc8f5, reversing
changes made to c5b766a9a20c9dd5bf09e69a7c508f369c2eeea3.

Travis can only build a commit it can clone; without any clone depth,
all branch builds error as soon as there's a newer commit present.

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