bitbake: Force -S option to take a parameter

There is no easy way to make this change. We really need parameters for the -S
(dump signatures) handling code. Such a parameter can then be used within the
codebase to handle the signatures in different ways.

For now, "none" is the recommended default and "printdiff" will execute the
new (and more expensive) comparison algorithms.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
runqueue/siggen: Pass in commandline options to dump_sigs()

This allows the commandline options to be processed in the dump signature
code.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
cooker/event: Overhaul sanity test mechanism

Sanity tests are currently a pain as its hard to control when they run. This results
in issues where for example the bitbake -e output is not useful as the sanity tests
prevent it from executing. The sanity tests should run later than the base configuration.

This patch changes the sanity tests to always be event triggered with the option of
returning either events on the status, or raising errors. A new cooker feature is used
to change the behaviour depending on the controlling UI.

This does need a change to sanity.bbclass in the OE metadata but its worth the pain
for the increased flexibility and control this offers UIs and the improvement to the
user experience.

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