poky-qemu-internal: implement file locking in bash

There does not appear to be a universal lockfile utility that
meets our needs. For example:

* 'lockfile' is part of the procmail pacakge in Ubuntu, a
  requirement we don't want to impose on our users
* lockfile-[create|remove] from the Ubuntu lockfile-progs
  package does not appear to be available in Fedora/openSUSE

So, the most portable way to do this is just to implement it
in bash. The likelihood of race conditions is minimal for
what we need this for.

Signed-off-by: Scott Garman <scott.a.garman@intel.com>

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