MINOR: ssl: add fetches and ACLs to return verify errors

MINOR: ssl: add fetches and ACLs to return verify errors

Add fetch 'ssl_verify_caerr':
returns the first ssl verify error at depth > 0 (CA chain).

Add fetch 'ssl_verify_caerr_depth':
returns the first ssl verify error depth (max returns is 15 if depth > 15).

Add fetch 'ssl_verify_crterr':
returns the fist ssl verify error at depth == 0.