(#5606) Print Augeas' /augeas//error info to debug on save failure #23
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When saving fails, the contents of /augeas//error (for put_failed) are printed to the debug log. Should help users track down the issue without needing to replicate it with augtool.
NOTE: I've cherry-picked the bug fix for #8808 into this branch as it's necessary for this feature to work. #8808 was originally against 2.7.x, not master.