revert cafile error handling, continue with nil

This reverts commit 2a5e8587f65cac4780647d80b9e48e9695044b58.
IMPORT PATH MODIFICATION CHANGESET
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Please use this changeset as the first one on top of the conformal codebase.
Note that if there are new imports, they need to be changed as part of this
changeset. In general, use "git rebase" on github.com/conformal's version
and apply this changeset first.
Squash 61 changesets.

Implement voting pools deposit side.