config.feature: Enable passing tests for dnf5

Some adjustments were needed due to different messages in dnf4/dnf5.
There still is one failing scenario - I added a comment with a link to
the dnf5 issue.

dnf-behave-tests/dnf/config.feature

@@ -60,6 +60,7 @@ Scenario: Test with dnf.conf in installroot and --config (dnf.conf is taken from
         """
 
 
+@dnf5
 Scenario: Reposdir option in dnf.conf file in installroot
   Given I configure dnf with
         | key      | value      |
@@ -76,6 +77,7 @@ Scenario: Reposdir option in dnf.conf file in installroot
         | install-dep   | setup-0:2.12.1-1.fc29.noarch      |
 
 
+@dnf5
 Scenario: Reposdir option in dnf.conf file with --config option in installroot
   Given I create file "/test/dnf.conf" with
     """
@@ -94,6 +96,7 @@ Scenario: Reposdir option in dnf.conf file with --config option in installroot
         | install-dep   | setup-0:2.12.1-1.fc29.noarch      |
 
 
+@dnf5
 Scenario: Reposdir option set by --setopt
   Given I configure a new repository "testrepo" in "{context.dnf.installroot}/testrepos" with
         | key     | value                                                   |
@@ -151,6 +154,8 @@ Scenario: Lines that contain only whitespaces do not spoil previous config optio
    """
 
 
+# dnf5 does not support remote config files
+# https://github.com/rpm-software-management/dnf5/issues/1767
 @bz1721091
 Scenario: Dnf can use config file from remote location
   Given I create directory "/remotedir"
@@ -188,6 +193,7 @@ Scenario: Dnf prints reasonable error when remote config file is not downloadabl
    And stderr contains "Configuration file.*not found"
 
 
+@dnf5
 @no_installroot
 Scenario: Create dnf.conf file and test if host is using /etc/dnf/dnf.conf
   Given I use repository "simple-base"
@@ -198,17 +204,15 @@ Scenario: Create dnf.conf file and test if host is using /etc/dnf/dnf.conf
     """
    When I execute dnf with args "install vagare"
    Then the exit code is 1
-    And stdout is
-        """
-        All matches were filtered out by exclude filtering for argument: vagare
-        """
     And stderr is
         """
         <REPOSYNC>
-        Error: Unable to find a match: vagare
+        Failed to resolve the transaction:
+        Argument 'vagare' matches only excluded packages.
         """
 
 
+@dnf5
 @no_installroot
 Scenario: Create dnf.conf file and test if host is taking option --config /test/dnf.conf file
   Given I use repository "simple-base"
@@ -230,14 +234,11 @@ Scenario: Create dnf.conf file and test if host is taking option --config /test/
         | install-dep   | labirinto-1.0-1.fc29.x86_64           |
    When I execute dnf with args "--config /test/dnf.conf install dedalo-signed"
    Then the exit code is 1
-    And stdout is
-        """
-        All matches were filtered out by exclude filtering for argument: dedalo-signed
-        """
     And stderr is
         """
         <REPOSYNC>
-        Error: Unable to find a match: dedalo-signed
+        Failed to resolve the transaction:
+        Argument 'dedalo-signed' matches only excluded packages.
         """
 
 
@@ -285,6 +286,7 @@ Scenario: dnf.conf is taken from host if --use-host-config is used
     """
 
 
+@dnf5
 @no_installroot
 Scenario: Reposdir option in dnf.conf file in host
   Given I configure dnf with