MINOR: ssl/cli: show/dump ssl crt-list

MINOR: ssl/cli: show/dump ssl crt-list

Implement 2 new commands on the CLI:

show ssl crt-list [<filename>]: Without a specified filename, display
the list of crt-lists used by the configuration. If a filename is
specified, it will displays the content of this crt-list, with a line
identifier at the beginning of each line. This output must not be used
as a crt-list file.

dump ssl crt-list <filename>: Dump the content of a crt-list, the output
can be used as a crt-list file.

Note: It currently displays the default ssl-min-ver and ssl-max-ver
which are potentialy not in the original file.