In the *service* field of connection records, GridFTP control channels
are labeled as "gridftp" and data channels as "gridftp-data".
Added *client_subject* and *client_issuer_subject* as &log'd fields to
SSL::Info record. Also added *client_cert* and *client_cert_chain*
fields to track client cert chain.
- Skip diffing of debug.log always.
- Skip diffing of reporter.log if it only contains an error about
missing GeoIP support.
- Canonicalize X.509 Distinguished Name subjects since that can vary
depending on installed OpenSSL version.