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

This patch adds the "del ssl ca-file <cafile>" CLI command which can be
used to delete an unused CA file.
The CA file will be considered unused if its list of ckch instances is
empty. This command cannot be used to delete the uncommitted CA file of
a previous "set ssl ca-file" without commit. It only acts on
CA file entries already inserted in the CA file tree.

This fixes a subpart of GitHub issue #1057.
1 file changed