Convert openssl(1) ca option handling

Convert openssl(1) ca option handling

New option handling for openssl(1) ca.
This diff is just replacing with new option handling, no functional change.
I'm using the word DN or RDN in description as manual uses them, rather than
replacing with "Distinguished Name" or "Relative Distinguished Name".

I would like to add another fixes below by follow-up diffs.
- remove space between '*' and pointer variable
- wrap 80+ long lines
- explicitly check pointer variable if it is NULL or not

comments and ok from jsing@