samples: net: Multiple instances of QEMU

Makefiles which start QEMU (make run) have been changed to operate
off of the QEMU_INSTANCE variable. QEMU_INSTANCE is simply appended
to the pid and sock file names. This makes us able to run multiple
QEMU Zephyr instances of the same sample.

Signed-off-by: John Andersen <john.s.andersen@intel.com>
2 files changed