Find the location of the client certificate, which is typically in a default
location on disk, unless the 'location' slot has been set with a custom location for
the certificate.
getCertLocation(x, ...)# S4 method for CertificateManager
getCertLocation(x)
a CertificateManager instance
(Not yet used)
character the path to the certificate
The default Globus Grid Security Infrastructure (GSI) location is '/tmp/x509up_u${UID}'
on Unix or '${tmpdir}/x509up_u${UID}' on Windows or '${tmpdir}/x509up_u${user.name}'
if '${UID}' is not defined.