oe-selftest: fitimage cleanup

This is a comprehensive cleanup of the fitImage related test cases.
The existing test cases were essentially the same code copied and pasted
9 times. All 9 test cases contained the code to parse an its file and to
parse the output of the dumpimage utility in slightly different variants.
Changing the kernel-fitimage.bbclass or the uboot-sign.bbclass would mean
changing 9 test cases individually. This is no longer maintainable.

This cleanup converts the code into reusable functions. The new test
code is more like a reverse implementation of the bbclasses to be tested
than a collection of straightforward test sequences.
This also means that the test code evaluates the same bitbake variables
as the implementation. This makes it much easier to add new test cases,
as a test case is basically just another local.conf file. The code is
not yet complete. But it can now be improved step by step in this
direction.

(From OE-Core rev: 1dfa03a182d9d9e9e38c410847c7dac4ed7e8ce6)

Signed-off-by: Adrian Freihofer <adrian.freihofer@siemens.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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