echo_cp() - copy files from one host to another by cat'ing their contents

useful because it can use remote_py() and therefor work locally without
using ssh

Fail startall() and stopall() if one of sub-actions fails
Use the more portable -k instead of -B in calls to df
Fix up the BSC scenario

CVS patchset: 9303
CVS date: 2006/04/19 11:57:02

Mercurial revision: 6be8b4dd3d79ed36f8be779f54f3f71cbb423eaf