[OE-core] base_ , oe.utils , bb.utils confusion

[Carlos Rafael Giani]

Hello,

I've noticed that the base_* functions have been compatibility wrappers 
for a while now.
What is confusing though is that some of the replacements are in 
bb.utils , others in oe.utils. For example, base_contains becomes 
bb.utils.contains, while base_conditional becomes oe.utils.conditional.
Is there any reason for this difference?