apache: Create snake oil certificate if not exists

Joseph Nuthalapatirequested to merge
njoseph/plinth:apache-snake-oil-new into master

When FreedomBox package is installed on a fresh Debian machine where a snakeoil certificate doesn't exist, generate a new one.

Fixes #1923 (closed) Fixes #1999 (closed)

Signed-off-by: Joseph Nuthalapati njoseph@riseup.net

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