bitbake/data_smart: Improve the way lazyassignment works

Currently, if a variable has been set with ??= and the code looks it up
before the data finalisation phase, no value is found. This is causes
serious problems for anonymous python functions which manipulate data, or
for the fetcher revision handling code where revisions can be set with
??=.

There is also a significant performance implication for processing lazy
assignment in finalise.

Moving the check for a default value into getVarFlag addresses both
the timing issue and the performace. This change gives a 7% real time
performance improvement to parsing the Poky metadata. The cost of the
check at this point is minimal since we have all the data flags available.

This should also fix Yocto bug 752.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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