oeqa/selftest: support sets in devtool comparisons
The devtool and recipetool tests do literal string comparisons, but for some
fields the ordering could be irrelevant and potentially non-deterministic. For
example, the recipetool_create_simple test started failing with:
AssertionError: 'GPLv2 Unknown' != 'Unknown GPLv2' : values for LICENSE do not match
The ordering of the LICENSE field isn't relevant. So, if the expected value is
a set(), split the string into a set too and compare those.
Signed-off-by: Ross Burton <ross.burton@intel.com>
