Don't require cert/serverca for kojid
Now is demanded from user to supply kojid-specific configuration or
previously expected files are used as defaults
(/etc/kojid/serverca.crt). So, user has no option to not use these and
use just system-wide certificates.
If these values are not specified, python-requests would fall back to
/etc/pki supplied files. If there is also ssl_verify=True (which is
default), everything should work correctly.