Enable koji content generator code

If the koji_enable_content_generator is configured to True koji instance
has to be configured as follows:
koji call addBType module
koji grant-cg-access <mbs-user> module-build-service --new

Without the above configuration MBS will start failing the builds

conf/config.py

@@ -32,6 +32,7 @@ class BaseConfiguration(object):
     KOJI_PROXYUSER = True
     KOJI_REPOSITORY_URL = 'https://kojipkgs.fedoraproject.org/repos'
     KOJI_TAG_PREFIXES = ['module']
+    KOJI_ENABLE_CONTENT_GENERATOR = True
     COPR_CONFIG = '/etc/module-build-service/copr.conf'
     PDC_URL = 'http://pdc.fedoraproject.org/rest_api/v1'
     PDC_INSECURE = True

module_build_service/config.py

@@ -186,6 +186,11 @@ class Config(object):
             'default': 24*3600,
             'desc': 'Time in seconds after which the Koji target of '
                 'built module is deleted'},
+        'koji_enable_content_generator': {
+            'type': bool,
+            'default': True,
+            'desc': 'Enable or disable imports to koji using content '
+                'generator api'},
         'allow_custom_scmurls': {
             'type': bool,
             'default': False,

module_build_service/scheduler/handlers/modules.py

@@ -30,6 +30,7 @@ import module_build_service.utils
 import module_build_service.messaging
 from module_build_service.utils import (
     start_next_batch_build, attempt_to_reuse_all_components)
+from module_build_service.builder.KojiContentGenerator import KojiContentGenerator
 
 from requests.exceptions import ConnectionError
 
@@ -120,6 +121,11 @@ def done(config, session, msg):
         # This is ok.. it's a race condition we can ignore.
         pass
 
+    if config.system == 'koji' and config.koji_enable_content_generator:
+        # KojiContentGenerator import
+        cg = KojiContentGenerator(build, config)
+        cg.koji_import()
+
     build.transition(config, state="ready")
     session.commit()