vxn: fix non-interactive mode for clean container output

Fix several issues preventing non-interactive mode (vxn --no-daemon run)
from showing clean container output:

- Fix console capture: check DAEMON_MODE instead of DAEMON_SOCKET in Xen
  backend so ephemeral runs use xl console capture instead of the daemon
  socat bridge (DAEMON_SOCKET is always set, DAEMON_MODE is only "start"
  for actual daemon launches)
- Fix race condition: add post-loop marker detection after VM exits,
  with 2s delay for xl console to flush its buffer
- Add stdbuf -oL to xl console for line-buffered output
- Suppress mke2fs stdout (was only redirecting stderr)
- Suppress kernel console messages during VM lifecycle in non-verbose mode
- Fix grep -P (Perl regex) for BusyBox compatibility in exit code parsing
- Preserve temp directory on failure for debugging
- Fix hardcoded "QEMU" in error messages to "VM"

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>

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