fix failure handling for myproxy_creds_retrieve() calls in myproxy_creds_retrieve_all_ex(): 1) when trying to load default credential, it's not an error if we    don't find one - this is a fix to my last commit 2) when scanning directory, if we fail to load a credential that    should be there, don't rely on creds structure that may be cleared,    but instead use stashed values when logging error
fix failure handling for myproxy_creds_retrieve() calls in
myproxy_creds_retrieve_all_ex():
1) when trying to load default credential, it's not an error if we
   don't find one - this is a fix to my last commit
2) when scanning directory, if we fail to load a credential that
   should be there, don't rely on creds structure that may be cleared,
   but instead use stashed values when logging error

ellert/globus-toolkit,globus/globus-toolkit,ellert/globus-toolkit,ellert/globus-toolkit,gridcf/gct,globus/globus-toolkit,globus/globus-toolkit,ellert/globus-toolkit,gridcf/gct,gridcf/gct,gridcf/gct,gridcf/gct,gridcf/gct,globus/globus-toolkit,ellert/globus-toolkit,globus/globus-toolkit,globus/globus-toolkit,globus/globus-toolkit,globus/globus-toolkit,ellert/globus-toolkit,ellert/globus-toolkit,ellert/globus-toolkit