endeavour: clean up scripts

[jamesanunez]

The following modifications were made to the Endeavour scripts:

1. In run_client.sh, we export the TB variable when calling
   mount_defuse.sh. mount_dfuse.sh doesn't use the TB variable.
   Thus, we can remove the export of the TB variable when calling
   mount_defuse.sh.
2. Both clean_agents.sh and start_agent.sh source client_env.sh.
   The script run_client.sh sources client_env.sh in the clush
   calls to clean_agents.sh and start_agent.sh. We don't need to
   source client_env.sh in the clush call.
3. In run_client.sh, we call “ls -al /panfs/users/${USER}/apps/${MPI}/lammps”
   no matter what application is being executed. We can remove this
   call to 'ls'.
4. The script start_agent.sh removes and then creates the DAOS mount
   point. Removing and creating the mount point doesn't have anything
   to do with starting the agent and should be removed. The run_clientsh
   script removes and creates the DAOS mount point.
5. We can remove the duplicate calls to adding FUSE to the PATH
   and LD_LIBRARY_PATH variables.

Signed-off-by: James Nunez [email protected]