added globus_gram_client_ping() API call.
added globus_gram_client_ping() API call.

Removed the authentication code from the globus_gram_job_request() API and
put it in a new local function called globus_l_gram_client_authentication().
This new function is called in both the ping and job_request functions.

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