CI: Remove repro from fast testing

Remove repro test from `fast` to make it little more fast.

Signed-off-by: Anton Mikanovich <amikan@ilbers.de>

testsuite/build_test/build_test.py

@@ -22,7 +22,7 @@ class ReproTest(CIBaseTest):
     """
     Test cached base repository
 
-    :avocado: tags=repro,fast,full
+    :avocado: tags=repro,full
     """
     def test_repro_signed(self):
         targets = [