Revert "selftest/sstatetests: run CDN mirror check only once"

This reverts commit 0d3901b768272abc2e27ba2ab807dad24917e0cf.

We've still having CDN issues so go back to the double attempt to
see if this improves things.

(From OE-Core rev: 136f0edb75d9601a0ae56e025419d3cddfb90219)

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

meta/lib/oeqa/selftest/cases/sstatetests.py

@@ -986,10 +986,12 @@ MACHINE = "{}"
 
     def test_cdn_mirror_qemux86_64(self):
         exceptions = []
+        self.run_test("qemux86-64", "core-image-minimal core-image-full-cmdline core-image-sato-sdk", exceptions, ignore_errors = True)
         self.run_test("qemux86-64", "core-image-minimal core-image-full-cmdline core-image-sato-sdk", exceptions)
 
     def test_cdn_mirror_qemuarm64(self):
         exceptions = []
+        self.run_test("qemuarm64", "core-image-minimal core-image-full-cmdline core-image-sato-sdk", exceptions, ignore_errors = True)
         self.run_test("qemuarm64", "core-image-minimal core-image-full-cmdline core-image-sato-sdk", exceptions)
 
     def test_local_cache_qemux86_64(self):