insane.bbclass: use contains in do_package_qa

insane.bbclass: use contains in do_package_qa

I was wondering why WARN_QA isn't causing this issue only ERROR_QA is.

It's easy to see with ALL_QA which is defined by both WARN_QA and ERROR_QA:
Variable ALL_QA value is ${WARN_QA} ${ERROR_QA}

but the variable depends only on ERROR_QA:
List of dependencies for variable ALL_QA is ['ERROR_QA']

that's because bitbake.conf adds WARN_QA in BB_HASHEXCLUDE_COMMON but
not ERROR_QA.

And then ALL_QA pulls dependency on whole ERROR_QA because of this:
    if 'libdir' in d.getVar("ALL_QA").split():

Unfortunately this still isn't enough, with this applied I still see
in bitbake-diffsigs output:
List of dependencies for variable ERROR_QA is []
List of dependencies for variable oe.qa.handle_error is ['ERROR_QA', 'oe.qa.write_error']
Variable ERROR_QA value is dev-so debug-deps
Variable oe.qa.handle_error value is

Need to debug the parser a bit to find why it still tracks whole ERROR_QA.

[YOCTO #15515]

Signed-off-by: Martin Jansa <martin.jansa@gmail.com>