orchestra.run: log the ssh command without prefix

orchestra.run: log the ssh command without prefix

run() also supports single string, but if we pass a longstring literal
which contains "\n", it renders log difficult to read.
in this change, multi-line command is logged in multiple lines,
and print the "prefix" in the first line, then print the command in
following lines without "prefix".

Signed-off-by: Kyr Shatskyy <kyrylo.shatskyy@suse.com>