Description of problem: Let's say we have ModuleA:f26:1 installed into the system. There is an updated version of ModuleA (ModuleA:f26:2) which now depends on ModuleB. When updating ModuleA, dnf does not install ModuleB.


Version-Release number of selected component (if applicable): 2.7.5-14


How reproducible: always


Steps to Reproduce:
1. Given module definitions:
        ---
        data:
          name: ModuleA
          stream: f26
          version: 1
          summary: Module ModuleA summary
          description: Module ModuleA description
          license:
            module: [MIT]
          profiles:
            default:
              rpms: [TestA]
          artifacts:
            rpms: ["TestA-0:1-1.modA.noarch"]
          components:
            rpms:
              TestA: {rationale: 'rationale for TestA'}
        document: modulemd
        version: 2
        ---
        data:
          name: ModuleA
          stream: f26
          version: 2
          summary: Module ModuleA summary
          description: Module ModuleA description
          license:
            module: [MIT]
          dependencies:
            - requires:
                ModuleB: []
          profiles:
            default:
              rpms: [TestA]
          artifacts:
            rpms: ["TestA-0:2-1.modA.noarch"]
          components:
            rpms:
              TestA: {rationale: 'rationale for TestA'}
        document: modulemd
        version: 2
        ---
        data:
          name: ModuleB
          stream: f26
          version: 1
          summary: Module ModuleB summary
          description: Module ModuleB description
          license:
            module: [MIT]
          profiles:
            minimal:
              rpms: [TestB]
          artifacts:
            rpms: ["TestB-0:1-1.modB.noarch"]
          components:
            rpms:
              TestB: {rationale: 'rationale for TestB'}
        document: modulemd
        version: 2

2. And a file "/etc/dnf/modules.defaults.d/ModuleB.yaml" with
        """
        document: modulemd-defaults
        version: 1
        data:
          module: ModuleB
          stream: f26
          profiles:
            f26: [minimal]
        """
3. Install ModuleA:f26:1
4. Update ModuleA

Actual results: ModuleB is not installed


Expected results: ModuleB's default stream ('minimal') is installed


Additional info:
      Captured stdout:
      shell.command: ['dnf-3', 'module', 'install', 'ModuleA:f26:1', '-y']
      shell.command.stdout:
      Last metadata expiration check: 0:00:00 ago on Fri May 25 14:18:52 2018.
      Dependencies resolved.
      ================================================================================
       Package        Arch            Version             Repository             Size
      ================================================================================
      Installing module packages:
       TestA          noarch          1-1.modA            modularityAB          6.4 k
      
      Transaction Summary
      ================================================================================
      
      Total size: 6.4 k
      Installed size: 0  
      Downloading Packages:
      Running transaction check
      Transaction check succeeded.
      Running transaction test
      Transaction test succeeded.
      Running transaction
        Preparing        :                                                        1/1 
        Installing       : TestA-1-1.modA.noarch                                  1/1 
        Verifying        : TestA-1-1.modA.noarch                                  1/1 
      
      Complete!
      
      shell.command.stderr:
      
      shell.command: ['dnf-3', 'module', 'update', 'ModuleA', '-y']
      shell.command.stdout:
      Last metadata expiration check: 0:00:01 ago on Fri May 25 14:18:52 2018.
      Dependencies resolved.
      ================================================================================
       Package        Arch            Version             Repository             Size
      ================================================================================
      Upgrading:
       TestA          noarch          2-1.modA            modularityAB          6.4 k
      Installing dependencies:
       TestC          noarch          1-1                 modularityAB          6.3 k
      
      Transaction Summary
      ================================================================================
      Install  1 Package
      Upgrade  1 Package
      
      Total size: 13 k
      Downloading Packages:
      Running transaction check
      Transaction check succeeded.
      Running transaction test
      Transaction test succeeded.
      Running transaction
        Preparing        :                                                        1/1 
        Installing       : TestC-1-1.noarch                                       1/3 
        Upgrading        : TestA-2-1.modA.noarch                                  2/3 
        Cleanup          : TestA-1-1.modA.noarch                                  3/3 
        Verifying        : TestC-1-1.noarch                                       1/3 
        Verifying        : TestA-2-1.modA.noarch                                  2/3 
        Verifying        : TestA-1-1.modA.noarch                                  3/3 
      
      Installed:
        TestC.noarch 1-1                                                              
      
      Upgraded:
        TestA.noarch 2-1.modA                                                         
      
      Complete!

Notice that running "dnf module install ModuleB" works as expected and install the default stream.