MINOR: ssl: Add "abort ssl ca-file" CLI command

The "abort" command aborts an ongoing transaction started by a "set ssl
ca-file" command. Since the updated CA file data is not pushed into the
cafile tree until a "commit ssl ca-file" call is performed, the abort
command simply clears the new cafile_entry that was stored in the
cafile_transaction.

This fixes a subpart of GitHub issue #1057.
2 files changed