Use git rather than gh repo as both are synced anyway.

slapos/software/osie-runtime/software.cfg

@@ -19,8 +19,7 @@ parts =
 index = https://pypi.python.org/simple/
 
 [sources]
-beremiz = hg https://hg.beremiz.org/beremiz/
-
+beremiz = git https://github.com/beremiz/beremiz.git branch=default
 
 [beremiz]
 recipe  = zc.recipe.egg:develop