MINOR: cfgparse: move parsing of "ca-base" and "crt-base" to ssl_sock

MINOR: cfgparse: move parsing of "ca-base" and "crt-base" to ssl_sock

This removes 2 #ifdefs and makes the code much cleaner. The controls
are still there and the two parsers have been merged into a single
function ssl_parse_global_ca_crt_base().

It's worth noting that there's still a check to prevent a change when
the value was already specified. This test seems useless and possibly
counter-productive, it may have to be revisited later, but for now it
was implemented identically.