repos: Option to generate recursive report w/o summary

On certain graphs, repeative topolgical sorting takes
too much time. So, we introduce an option to disable
the summary and produce all the required build
reports only.

repos_cmp/repos.py

@@ -390,7 +390,7 @@ def _src_name(source):
 
 
 def recursive_build_report(from_repo, to_repo, *source_names,
-                           ignore=(), ignore_sort=()):
+                           ignore=(), ignore_sort=(), summary=True):
     reports = []
     build_source_deps = {}
     pkg_source_deps = {}
@@ -435,6 +435,9 @@ def recursive_build_report(from_repo, to_repo, *source_names,
             dep_sources.add(b.source_name)
         full_req[source] = dep_sources
 
+    if not summary:
+        return '\n'.join(reports)
+
     cycles = []
     while True:
         try: