MINOR: ssl/cli: replace dump/show ssl crt-list by '-n' option

MINOR: ssl/cli: replace dump/show ssl crt-list by '-n' option

The dump and show ssl crt-list commands does the same thing, they dump
the content of a crt-list, but the 'show' displays an ID in the first
column. Delete the 'dump' command so it is replaced by the 'show' one.
The old 'show' command is replaced by an '-n' option to dump the ID.
And the ID which was a pointer is replaced by a line number and placed
after colons in the filename.

Example:
  $ echo "show ssl crt-list -n kikyo.crt-list" | socat /tmp/sock1 -
  # kikyo.crt-list
  kikyo.pem.rsa:1 secure.domain.tld
  kikyo.pem.ecdsa:2 secure.domain.tld