test/bundle: add checks for revocation handling
test/bundle: add checks for revocation handling

* check that CRLs are handled if check-crl is enabled
* check that CLRs trigger a warning if check-crl is disabled

This also includes two hacks to avoid cross contamination of tests.
To actually fix this, it would be required to more cleanly split up the
context set up in test setup and teardown methods.

Signed-off-by: Enrico Joerns <a2e5f936c390f36494e46e71bcfbe365bb1e8c49@pengutronix.de>

rauc/rauc,rauc/rauc,ejoerns/rauc,jluebbe/rauc,ejoerns/rauc,jluebbe/rauc,ejoerns/rauc,rauc/rauc,jluebbe/rauc