runqemu: log parameters correctly within testimage

It is not a good idea to mix logging and calls to print() - if the
output is being captured the result can be that the two types of output
are not recorded contiguously; this could be observed if an error
occurred running runqemu from inside testimage:

---------- snip ----------
ERROR: core-image-minimal-1.0-r0 do_testimage: Output from runqemu:
runqemu - INFO - Continuing with the following parameters:

runqemu - INFO - Setting up tap interface under sudo
sudo: a terminal is required to read the password; either use the -S option to read from standard input or configure an askpass helper
runqemu - ERROR - Setting up tap device failed:
Command '('sudo', '/home/paul/poky/poky/scripts/runqemu-ifup', '1000', '1000', '/home/paul/poky/poky/build/tmp/work/x86_64-linux/qemu-helper-native/1.0-r1/recipe-sysroot-native/usr/bin')' returned non-zero exit status 1.
Run runqemu-gen-tapdevs to manually create one.
runqemu - INFO - Cleaning up
KERNEL: [/home/paul/poky/poky/build/tmp/deploy/images/qemux86-64/bzImage--5.2.20+git0+bd0762cd13_dd25a04fc5-r0-qemux86-64-20191205213021.bin]
MACHINE: [qemux86-64]
FSTYPE: [ext4]
ROOTFS: [/home/paul/poky/poky/build/tmp/deploy/images/qemux86-64/core-image-minimal-qemux86-64.ext4]
CONFFILE: [/home/paul/poky/poky/build/tmp/deploy/images/qemux86-64/core-image-minimal-qemux86-64.qemuboot.conf]
---------- snip ----------

What we should see here is the KERNEL, MACHINE, etc. lines appearing
immediately after the "Continuing with the following parameters:" line
as they do when you run runqemu directly. If we put all of the lines
through the logger instead then it works properly.

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>

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