Fix problems with cert specifications causing replication_ssl to fail

Fix problem with cacertdir specification in replication_ssl test. The
code used load cert files in v2 replication expects the path specific
by the cacertdir key to only be a directory. With v3 replication the
code used is flexible enough to allow a directory or a file. Also
correct a typo in the certfile path for the SSLConfig1 configuration.
Merge branch 'bugfix/replication-ssl-fix'