Add test for --transient and persistence option

The --transient flag only works on a bootc system, but we should test
that it throws the correct error and doesn't do anything unexpected on
non-bootc systems.

Requires rpm-software-management/dnf#2180 and
rpm-software-management/libdnf#1683.

dnf-behave-tests/dnf/transient.feature

@@ -0,0 +1,36 @@
+Feature: Persistence option and --transient
+
+
+Scenario: Try installing a package using --transient on a non-bootc system
+  Given I use repository "dnf-ci-fedora"
+   When I execute dnf with args "install flac --transient"
+   Then the exit code is 1
+    And stderr is
+    """
+    Transient transactions are only supported on bootc systems.
+    """
+
+Scenario: Try installing a package with persistence=transient on a non-bootc system
+  Given I use repository "dnf-ci-fedora"
+   When I execute dnf with args "install flac --setopt=persistence=transient"
+   Then the exit code is 1
+    And stderr is
+    """
+    Transient transactions are only supported on bootc systems.
+    """
+
+Scenario: Install a package with persistence=auto on a non-bootc system
+  Given I use repository "dnf-ci-fedora"
+   When I execute dnf with args "install flac --setopt=persistence=auto"
+   Then the exit code is 0
+    And Transaction is following
+        | Action        | Package                                   |
+        | install       | flac-0:1.3.2-8.fc29.x86_64                |
+
+Scenario: Install a package with persistence=persist on a non-bootc system
+  Given I use repository "dnf-ci-fedora"
+   When I execute dnf with args "install flac --setopt=persistence=persist"
+   Then the exit code is 0
+    And Transaction is following
+        | Action        | Package                                   |
+        | install       | flac-0:1.3.2-8.fc29.x86_64                |