CLEANUP: ssl/cli: make "{show|dump} ssl crtlist" use its own context

These commands were using cli.i0/p0/p1 and in a not very clean way since
they use the same parser but with different types depending on the I/O
handler. Given there was no explanation about what the variables were
supposed to be, they were named based on best guess and placed into a
new "show_crtlist_ctx" structure.
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