Raise proper error when ModelViolationError occurs

This error occurs when repo file has invalid definition, specifically
when the 'name' entry of the config files is invalid.

Jira: RHEL-19249

repos/system_upgrade/common/actors/systemfacts/libraries/systemfacts.py

@@ -217,7 +217,18 @@ def get_sysctls_status():
 
 def get_repositories_status():
     """ Get a basic information about YUM repositories installed in the system """
-    return RepositoriesFacts(repositories=repofileutils.get_parsed_repofiles())
+    try:
+        return RepositoriesFacts(repositories=repofileutils.get_parsed_repofiles())
+    except repofileutils.InvalidRepoDefinition as e:
+        raise StopActorExecutionError(
+            message=str(e),
+            details={
+                'hint': 'For more directions on how to resolve the issue, see: {url}.'
+                        .format(
+                            url='https://access.redhat.com/solutions/6969001'
+                        )
+            }
+        )
 
 
 def get_selinux_status():

repos/system_upgrade/common/libraries/repofileutils.py

@@ -11,6 +11,15 @@
     api.current_logger().warning('repofileutils.py: failed to import dnf')
 
 
+class InvalidRepoDefinition(Exception):
+    def __init__(self, msg, repofile, repoid):
+        message = 'Invalid repository definition: {repoid} in: {repofile}: {msg}'.format(
+                    repoid=repoid, repofile=repofile, msg=msg)
+        super(InvalidRepoDefinition, self).__init__(message)
+        self.repofile = repofile
+        self.repoid = repoid
+
+
 def _parse_repository(repoid, repo_data):
     def asbool(x):
         return x == '1'
@@ -38,7 +47,10 @@ def parse_repofile(repofile):
     with open(repofile, mode='r') as fp:
         cp = utils.parse_config(fp, strict=False)
         for repoid in cp.sections():
-            data.append(_parse_repository(repoid, dict(cp.items(repoid))))
+            try:
+                data.append(_parse_repository(repoid, dict(cp.items(repoid))))
+            except Exception as e:
+                raise InvalidRepoDefinition(e, repofile=repofile, repoid=repoid)
     return RepositoryFile(file=repofile, data=data)