sanity: Improve configuration upgrade capabilities (support meta-yocto -> poky transition)

Right now, only one configuration file can be processed (conf/bblayers.conf)
and it can only have one version number. This is a cause of immense friction
between OE-Core and Poky since if one needs a version change, it shouldn't
be forced on the other.

We'd like to rename the meta-yocto layer (within the meta-yocto repository)
to meta-poky. To do this, we need to correct the bblayers.conf file and that
means changing the sanity version. After the pain this caused the last time,
Paul made me promise never to have them out of sync between OE-Core and Poky,
equally, having every distro changing config update OE-Core isn't scalable
either.

This patch changes the sanity upgrade method to list a more generic format:

<config file>:<current version variable name>:<required version variable name>:<upgrade function>

This in theory allows us to support upgrades to any of the core
configuration files, and allow layers to extend them as needed. Files
with the same name can be handled in different layers by setting a unique
version name variable in the file itself. The upgrade code is only called
if the version variable is set.

To allow us to make the poky name change and use a new configuration file
name, one last version bump is included for poky to handle the transition.

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

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