Add obsoletes tests for yum behavior

dnf-behave-tests/dnf/obsoletes-yum.feature

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+@dnf5
+Feature: Obsoles behavior specified by `SOLVER_FLAG_YUM_OBSOLETES` libsolv flag
+
+
+# dnf-3 fails this test, it incorrectly installs the new packages
+# as dependencies.
+Scenario: install all obsoleters (as user installed)
+  Given I use repository "obsoletes-yum"
+    And I successfully execute dnf with args "install wood-1.0"
+   When I execute dnf with args "upgrade"
+   Then the exit code is 0
+    And Transaction is following
+        | Action  | Package                    |
+        | install | copper-0:1.0-1.fc29.x86_64 |
+        | install | iron-0:1.0-1.fc29.x86_64   |
+        | upgrade | wood-0:2.0-1.fc29.x86_64   |
+   When I execute dnf with args "rq --installed --qf '%{{name}} - %{{reason}}\n'"
+   Then stdout is
+   """
+   copper - User
+   iron - User
+   wood - User
+   """
+

dnf-behave-tests/fixtures/specs/obsoletes-yum/copper-1.0-1.fc29.spec

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+Name: copper
+Version: 1.0
+Release: 1.fc29
+Summary: Made up package
+
+License: GPLv3+
+Url: None
+
+Obsoletes: wood < 2.0
+
+%description
+copper description
+
+%files
+
+%changelog

dnf-behave-tests/fixtures/specs/obsoletes-yum/iron-1.0-1.fc29.spec

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+Name: iron
+Version: 1.0
+Release: 1.fc29
+Summary: Made up package
+
+License: GPLv3+
+Url: None
+
+Obsoletes: wood < 2.0
+
+%description
+iron description
+
+%files
+
+%changelog

dnf-behave-tests/fixtures/specs/obsoletes-yum/wood-1.0-1.fc29.spec

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+Name: wood
+Version: 1.0
+Release: 1.fc29
+Summary: Made up package
+
+License: GPLv3+
+Url: None
+
+%description
+wood description
+
+%files
+
+%changelog

dnf-behave-tests/fixtures/specs/obsoletes-yum/wood-2.0-1.fc29.spec

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+Name: wood
+Version: 2.0
+Release: 1.fc29
+Summary: Made up package
+
+License: GPLv3+
+Url: None
+
+Obsoletes: wood < 2.0
+
+%description
+wood description
+
+%files
+
+%changelog