Use modulemd.dump_all to create local repodata

Both pungi and dnf use the new multidocument format, with the
old one not really being supported by anything at this point.
Let's be compatible.

This change requires modulemd-1.2.0+.

Signed-off-by: Petr Šabata <contyk@redhat.com>

module_build_service/builder/MockModuleBuilder.py

@@ -26,6 +26,7 @@ import logging
 import os
 import koji
 import kobo.rpmlib
+import modulemd
 import shutil
 import yaml
 import threading
@@ -163,12 +164,8 @@ mdpolicy=group:primary
 
         # Generate the mmd the same way as pungi does.
         m1 = ModuleBuild.query.filter(ModuleBuild.name == self.module_str).one()
-        modules = {"modules": []}
-        modules["modules"].append(yaml.safe_load(m1.mmd().dumps()))
         mmd_path = os.path.join(path, "modules.yaml")
-
-        with open(mmd_path, "w") as outfile:
-            outfile.write(yaml.safe_dump(modules))
+        modulemd.dump_all(mmd_path, [ m1.mmd() ])
 
         # Generate repo and inject modules.yaml there.
         execute_cmd(['/usr/bin/createrepo_c', path])

requirements.txt

@@ -11,7 +11,7 @@ kobo
 m2crypto
 m2ext
 mock
-modulemd>=1.1.0,<2.0.0
+modulemd>=1.2.0,<2.0.0
 munch
 pdc-client
 pyOpenSSL