data_smart: Add appendVar/prependVar functions

This patch adds appendVar and prependVar functions to the data store
meaning python code would no longer have to do the getVar, append and
the setVar dance that much of the current python code does.

It also adds corresponding variants for flags.

Currently there is no spacing added by these functions. That could be
added as a parameter if desired.

If these functions turn out to be hotspots in the code, there are tricks
that could potentially be used to increase the speed of these specific
operations within the datastore.

(Bitbake rev: 4a4046268f84b85559eea2c4b6a6004ad8cccb77)

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

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