selftest/SStateCacheManagement: pre-populate the cache

This is another source of the test slowness: for some configurations
(building x86 on x86) the cache items are pre-populated in other
builds. For others (building 32 bit x86 on arm), they're not. Without
this step, the test would build them, write them to a private
sstate, and then throw it away.

The code is un-pythonic: it follows the style of the rest of the test,
and fixing that is perhaps for some other time.

With these two changes the notoriously slow test_sstate_cache_management_script_using_machine
takes just under 6 minutes, on an arm worker:

https://autobuilder.yoctoproject.org/typhoon/#/builders/127/builds/2820/steps/13/logs/stdio

(From OE-Core rev: b685c955289bf4d7d70bd0f4c1530b2bf13a30a6)

Signed-off-by: Alexander Kanavin <alex@linutronix.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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