If there is no default credential cache obtained from the registry
or from configuration files, then check to see if there is a valid
principal available from the MSLSA: credential cache. If so, use
"MSLSA:" as the default credential cache. This will simply configuration
for users on domain joined Windows machines when logged in using a
domain account.
Change-Id: I4c4392e0fdcec89aff3d258ce1b753e6458e3eec